{"ok":true,"stats":{"total":203,"latest":"2026-07-10 17:48:44"},"tables":["pcp_chess_puzzles","chess_puzzles"],"selected":{"id":219,"puzzle_hash":"4cb349b355bc9156ca7b37f2b1d2551490000216fd46c75276f9111a711fe3ef","fen":"1r2N1k1/3P3p/2n2K2/3bP1B1/2q2p2/Q7/6R1/8 b - - 0 1","line_san":"1...Qe4?? 2.Qf8+!! Kxf8 3.Bh6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxe5#","material_note":"added rb8; material -5 -> 0; eval -983 -> +317 cp","payload":"{\"puzzle_hash\":\"4cb349b355bc9156ca7b37f2b1d2551490000216fd46c75276f9111a711fe3ef\",\"fen\":\"1r2N1k1/3P3p/2n2K2/3bP1B1/2q2p2/Q7/6R1/8 b - - 0 1\",\"line_san\":\"1...Qe4?? 2.Qf8+!! Kxf8 3.Bh6#\",\"generator_seed\":3761581951,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('N', 0, -2), ('P', -3, -2), ('P', -1, -3), ('Q', -5, -6), ('R', -6, 0), ('b', -3, -3), ('k', 0, 0), ('n', -2, -4), ('p', -4, -1), ('p', -1, 1), ('q', -4, -4), ('r', 0, -5))\",\"solution_key\":\"san:Qe4 Qf8 Kxf8 Bh6\",\"answer_key\":\"answer:Qf8 Kxf8 Bh6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxe5#\",\"threat_uci\":\"e4e5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers f7, g7 in the mate net.\",\"material_note\":\"added rb8; material -5 -> 0; eval -983 -> +317 cp\",\"force_notes\":[\"Only Qf8+ wins; 38 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxe5#\",\"THREAT_UCI: e4e5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers f7, g7 in the mate net.\",\"MATERIAL: added rb8; material -5 -> 0; eval -983 -> +317 cp\",\"FORCE: Only Qf8+ wins; 38 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxf8 forced\"]}","created_at":"2026-07-10 17:48:44","_table":"pcp_chess_puzzles"},"puzzles":[{"id":219,"puzzle_hash":"4cb349b355bc9156ca7b37f2b1d2551490000216fd46c75276f9111a711fe3ef","fen":"1r2N1k1/3P3p/2n2K2/3bP1B1/2q2p2/Q7/6R1/8 b - - 0 1","line_san":"1...Qe4?? 2.Qf8+!! Kxf8 3.Bh6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxe5#","material_note":"added rb8; material -5 -> 0; eval -983 -> +317 cp","payload":"{\"puzzle_hash\":\"4cb349b355bc9156ca7b37f2b1d2551490000216fd46c75276f9111a711fe3ef\",\"fen\":\"1r2N1k1/3P3p/2n2K2/3bP1B1/2q2p2/Q7/6R1/8 b - - 0 1\",\"line_san\":\"1...Qe4?? 2.Qf8+!! Kxf8 3.Bh6#\",\"generator_seed\":3761581951,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('N', 0, -2), ('P', -3, -2), ('P', -1, -3), ('Q', -5, -6), ('R', -6, 0), ('b', -3, -3), ('k', 0, 0), ('n', -2, -4), ('p', -4, -1), ('p', -1, 1), ('q', -4, -4), ('r', 0, -5))\",\"solution_key\":\"san:Qe4 Qf8 Kxf8 Bh6\",\"answer_key\":\"answer:Qf8 Kxf8 Bh6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxe5#\",\"threat_uci\":\"e4e5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers f7, g7 in the mate net.\",\"material_note\":\"added rb8; material -5 -> 0; eval -983 -> +317 cp\",\"force_notes\":[\"Only Qf8+ wins; 38 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxe5#\",\"THREAT_UCI: e4e5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers f7, g7 in the mate net.\",\"MATERIAL: added rb8; material -5 -> 0; eval -983 -> +317 cp\",\"FORCE: Only Qf8+ wins; 38 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxf8 forced\"]}","created_at":"2026-07-10 17:48:44","_table":"pcp_chess_puzzles"},{"id":218,"puzzle_hash":"8d8b445ca445162027b5f7c5c8d26349bd859069a536fb0551593d47464f764e","fen":"b2r4/1R4N1/5Pkb/8/4ppK1/2n1r1pQ/1B4n1/8 b - - 0 1","line_san":"1...Nd1?? 2.Qxh6+!! Kxh6 3.Nf5+ Kg6 4.Rg7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Nf2#","material_note":"added rd8, pe4, ba8; material -5 -> 4; eval -656 -> +470 cp","payload":"{\"puzzle_hash\":\"8d8b445ca445162027b5f7c5c8d26349bd859069a536fb0551593d47464f764e\",\"fen\":\"b2r4/1R4N1/5Pkb/8/4ppK1/2n1r1pQ/1B4n1/8 b - - 0 1\",\"line_san\":\"1...Nd1?? 2.Qxh6+!! Kxh6 3.Nf5+ Kg6 4.Rg7#\",\"generator_seed\":1985794617,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -5, -4), ('K', 0, -2), ('N', 0, 1), ('P', -1, 0), ('Q', 1, -3), ('R', -5, 1), ('b', -6, 2), ('b', 1, 0), ('k', 0, 0), ('n', -4, -3), ('n', 0, -4), ('p', -2, -2), ('p', -1, -2), ('p', 0, -3), ('r', -3, 2), ('r', -2, -3))\",\"solution_key\":\"san:Nd1 Qxh6 Kxh6 Nf5 Kg6 Rg7\",\"answer_key\":\"answer:Qxh6 Kxh6 Nf5 Kg6 Rg7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Nf2#\",\"threat_uci\":\"d1f2\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f5, g5, h5 in the mate net.\",\"material_note\":\"added rd8, pe4, ba8; material -5 -> 4; eval -656 -> +470 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxh6 forced\"},{\"ply\":4,\"text\":\"Kg6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Nf2#\",\"THREAT_UCI: d1f2\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f5, g5, h5 in the mate net.\",\"MATERIAL: added rd8, pe4, ba8; material -5 -> 4; eval -656 -> +470 cp\",\"NOTE 2: Kxh6 forced\",\"NOTE 4: Kg6 forced\"]}","created_at":"2026-07-10 17:47:59","_table":"pcp_chess_puzzles"},{"id":217,"puzzle_hash":"d3bc6341fc06dfc8a29190f6064954ca599e43506df048a5b6ca0a4d3d03c268","fen":"5Q2/p1N5/5B2/P1p1N1n1/pk6/1p1KPpq1/3b4/8 b - - 0 1","line_san":"1...Qf2?? 2.Qxc5+!! Kxc5 3.Be7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxe3#","material_note":"added pa7; material -1 -> 0; eval +31 -> +234 cp","payload":"{\"puzzle_hash\":\"d3bc6341fc06dfc8a29190f6064954ca599e43506df048a5b6ca0a4d3d03c268\",\"fen\":\"5Q2/p1N5/5B2/P1p1N1n1/pk6/1p1KPpq1/3b4/8 b - - 0 1\",\"line_san\":\"1...Qf2?? 2.Qxc5+!! Kxc5 3.Be7#\",\"generator_seed\":3089757500,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('K', -2, 1), ('N', -3, -1), ('N', -1, -3), ('P', -3, 1), ('P', 1, -1), ('Q', -4, -4), ('b', -2, 2), ('k', 0, 0), ('n', -5, -1), ('p', -4, 1), ('p', -1, -1), ('p', 0, 1), ('p', 1, -3), ('p', 1, 0), ('q', -5, 1))\",\"solution_key\":\"san:Qf2 Qxc5 Kxc5 Be7\",\"answer_key\":\"answer:Qxc5 Kxc5 Be7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxe3#\",\"threat_uci\":\"f2e3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers c3, c4 in the mate net.\",\"material_note\":\"added pa7; material -1 -> 0; eval +31 -> +234 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxe3#\",\"THREAT_UCI: f2e3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers c3, c4 in the mate net.\",\"MATERIAL: added pa7; material -1 -> 0; eval +31 -> +234 cp\",\"NOTE 2: Kxc5 forced\"]}","created_at":"2026-07-10 17:15:27","_table":"pcp_chess_puzzles"},{"id":216,"puzzle_hash":"a416cb0572cff1fdc5fea1a3162419bc1798bbbd88495ae3ad4da40a03f2c7f1","fen":"3r2N1/7R/Q6P/3r1p1k/2b1pK2/3qp3/5B2/8 b - - 0 1","line_san":"1...Qd1?? 2.Qg6+!! Kxg6 3.Rg7+ Kh5 4.Rg5#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qf3#","material_note":null,"payload":"{\"puzzle_hash\":\"a416cb0572cff1fdc5fea1a3162419bc1798bbbd88495ae3ad4da40a03f2c7f1\",\"fen\":\"3r2N1/7R/Q6P/3r1p1k/2b1pK2/3qp3/5B2/8 b - - 0 1\",\"line_san\":\"1...Qd1?? 2.Qg6+!! Kxg6 3.Rg7+ Kh5 4.Rg5#\",\"generator_seed\":3045067068,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -1, -2), ('N', 3, -1), ('P', 1, 0), ('Q', 1, -7), ('R', 2, 0), ('b', -1, -5), ('k', 0, 0), ('p', -2, -3), ('p', -1, -3), ('p', 0, -2), ('q', -2, -4), ('r', 0, -4), ('r', 3, -4))\",\"solution_key\":\"san:Qd1 Qg6 Kxg6 Rg7 Kh5 Rg5\",\"answer_key\":\"answer:Qg6 Kxg6 Rg7 Kh5 Rg5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qf3#\",\"threat_uci\":\"d1f3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g4, g5 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg6 forced\"},{\"ply\":4,\"text\":\"Kh5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qf3#\",\"THREAT_UCI: d1f3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g4, g5 in the mate net.\",\"NOTE 2: Kxg6 forced\",\"NOTE 4: Kh5 forced\"]}","created_at":"2026-07-10 17:11:12","_table":"pcp_chess_puzzles"},{"id":215,"puzzle_hash":"e8234ddc0c20f8cf17a3ad4a67f8fee53f764ec5788ee159acd23ce4e402d1bd","fen":"3n3R/4pQ1p/1BbkP3/3p1Kp1/4pn1b/8/8/4q3 b - - 0 1","line_san":"1...Qf1?? 2.Qxe7+!! Kxe7 3.Bc5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qh3#","material_note":null,"payload":"{\"puzzle_hash\":\"e8234ddc0c20f8cf17a3ad4a67f8fee53f764ec5788ee159acd23ce4e402d1bd\",\"fen\":\"3n3R/4pQ1p/1BbkP3/3p1Kp1/4pn1b/8/8/4q3 b - - 0 1\",\"line_san\":\"1...Qf1?? 2.Qxe7+!! Kxe7 3.Bc5#\",\"generator_seed\":3820132957,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -2, 0), ('K', 2, -1), ('P', 1, 0), ('Q', 2, 1), ('R', 4, 2), ('b', -1, 0), ('b', 4, -2), ('k', 0, 0), ('n', 0, 2), ('n', 2, -2), ('p', 0, -1), ('p', 1, -2), ('p', 1, 1), ('p', 3, -1), ('p', 4, 1), ('q', 1, -5))\",\"solution_key\":\"san:Qf1 Qxe7 Kxe7 Bc5\",\"answer_key\":\"answer:Qxe7 Kxe7 Bc5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qh3#\",\"threat_uci\":\"f1h3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5, e6 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxe7+ meets the threat cleanly; 19 quiet moves still lose immediately.\",\"Non-direct tries checked: Qh5.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe7 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qh3#\",\"THREAT_UCI: f1h3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5, e6 in the mate net.\",\"FORCE: Only Qxe7+ meets the threat cleanly; 19 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Qh5.\",\"NOTE 2: Kxe7 forced\"]}","created_at":"2026-07-10 11:25:55","_table":"pcp_chess_puzzles"},{"id":214,"puzzle_hash":"73205e039824cc34e582672358b68456e08f7d43ee0c588db26f9349fd41db05","fen":"q7/8/1Q4R1/6B1/1n6/3B4/n2K2kP/3b3r b - - 0 1","line_san":"1...Qa3?? 2.Qf2+!! Kxf2 3.Be3+ Kf3 4.Rg3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qc1#","material_note":null,"payload":"{\"puzzle_hash\":\"73205e039824cc34e582672358b68456e08f7d43ee0c588db26f9349fd41db05\",\"fen\":\"q7/8/1Q4R1/6B1/1n6/3B4/n2K2kP/3b3r b - - 0 1\",\"line_san\":\"1...Qa3?? 2.Qf2+!! Kxf2 3.Be3+ Kf3 4.Rg3#\",\"generator_seed\":2520510586,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -1), ('B', 0, -3), ('K', -3, 0), ('P', 1, 0), ('Q', -5, -4), ('R', 0, -4), ('b', -3, 1), ('k', 0, 0), ('n', -6, 0), ('n', -5, -2), ('q', -6, -6), ('r', 1, 1))\",\"solution_key\":\"san:Qa3 Qf2 Kxf2 Be3 Kf3 Rg3\",\"answer_key\":\"answer:Qf2 Kxf2 Be3 Kf3 Rg3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qc1#\",\"threat_uci\":\"a3c1\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":null,\"force_notes\":[\"Only Qf2+ meets the threat cleanly; 30 quiet moves still lose immediately.\",\"Non-direct tries checked: Ke3.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Kh3, Qg3#\"},{\"ply\":4,\"text\":\"Kf3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc1#\",\"THREAT_UCI: a3c1\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"FORCE: Only Qf2+ meets the threat cleanly; 30 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Ke3.\",\"NOTE 2: If Kh3, Qg3#\",\"NOTE 4: Kf3 forced\"]}","created_at":"2026-07-10 10:44:01","_table":"pcp_chess_puzzles"},{"id":213,"puzzle_hash":"d88f532af4ad006c6320094febb52c805285612cdd09dc09b022076edbc6f5ec","fen":"Q7/1b6/1kp5/b2p2B1/Pp6/1K2n3/1Rp2q2/2r2B2 b - - 0 1","line_san":"1...Ra1?? 2.Qxa5+!! Kxa5 3.Bd8#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Ra3#","material_note":null,"payload":"{\"puzzle_hash\":\"d88f532af4ad006c6320094febb52c805285612cdd09dc09b022076edbc6f5ec\",\"fen\":\"Q7/1b6/1kp5/b2p2B1/Pp6/1K2n3/1Rp2q2/2r2B2 b - - 0 1\",\"line_san\":\"1...Ra1?? 2.Qxa5+!! Kxa5 3.Bd8#\",\"generator_seed\":2458521206,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -5, -4), ('B', -1, -5), ('K', -3, 0), ('P', -2, 1), ('Q', 2, 1), ('R', -4, 0), ('b', -1, 1), ('b', 1, 0), ('k', 0, 0), ('n', -3, -3), ('p', -4, -1), ('p', -2, 0), ('p', -1, -2), ('p', 0, -1), ('q', -4, -4), ('r', -5, -1))\",\"solution_key\":\"san:Ra1 Qxa5 Kxa5 Bd8\",\"answer_key\":\"answer:Qxa5 Kxa5 Bd8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Ra3#\",\"threat_uci\":\"a1a3\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":null,\"force_notes\":[\"Only Qxa5+ wins; 21 quiet moves allow mate in 1.\",\"6 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxa5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ra3#\",\"THREAT_UCI: a1a3\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"FORCE: Only Qxa5+ wins; 21 quiet moves allow mate in 1.\",\"FORCE: 6 checking tries do not solve the puzzle.\",\"NOTE 2: Kxa5 forced\"]}","created_at":"2026-07-09 20:46:08","_table":"pcp_chess_puzzles"},{"id":212,"puzzle_hash":"50c104f075882dd7ce4cf62c2c90ed90126eb2fa6ceb83d14af211a45d531446","fen":"3q4/8/3n4/2Qp1p2/5p1r/3p1KN1/RB4Pk/8 b - - 0 1","line_san":"1...Qg5?? 2.Qg1+!! Kxg1 3.Ra1+ Kh2 4.Rh1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxg3#","material_note":"added nd6; material -3 -> 0; eval +381 -> +398 cp","payload":"{\"puzzle_hash\":\"50c104f075882dd7ce4cf62c2c90ed90126eb2fa6ceb83d14af211a45d531446\",\"fen\":\"3q4/8/3n4/2Qp1p2/5p1r/3p1KN1/RB4Pk/8 b - - 0 1\",\"line_san\":\"1...Qg5?? 2.Qg1+!! Kxg1 3.Ra1+ Kh2 4.Rh1#\",\"generator_seed\":3982634781,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, 0), ('K', -2, -1), ('N', -1, -1), ('P', -1, 0), ('Q', -5, -3), ('R', -7, 0), ('k', 0, 0), ('n', -4, -4), ('p', -4, -3), ('p', -4, -1), ('p', -2, -3), ('p', -2, -2), ('q', -4, -6), ('r', 0, -2))\",\"solution_key\":\"san:Qg5 Qg1 Kxg1 Ra1 Kh2 Rh1\",\"answer_key\":\"answer:Qg1 Kxg1 Ra1 Kh2 Rh1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxg3#\",\"threat_uci\":\"g5g3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g2, g3 in the mate net.\",\"material_note\":\"added nd6; material -3 -> 0; eval +381 -> +398 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg1 forced\"},{\"ply\":4,\"text\":\"Kh2 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxg3#\",\"THREAT_UCI: g5g3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g2, g3 in the mate net.\",\"MATERIAL: added nd6; material -3 -> 0; eval +381 -> +398 cp\",\"NOTE 2: Kxg1 forced\",\"NOTE 4: Kh2 forced\"]}","created_at":"2026-07-09 20:30:59","_table":"pcp_chess_puzzles"},{"id":211,"puzzle_hash":"9cd6dfe21bf2f11d4f46adc30589b20db6d7ab4ef5dd0131dd43e8cc58fd9213","fen":"5bNr/2RB2k1/2PPK1b1/8/2n1pPQ1/8/2q4r/8 b - - 0 1","line_san":"1...Qd2?? 2.Qxg6+!! Kxg6 3.Be8#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxd6#","material_note":"added rh2; material 1 -> 6; eval -390 -> +487 cp","payload":"{\"puzzle_hash\":\"9cd6dfe21bf2f11d4f46adc30589b20db6d7ab4ef5dd0131dd43e8cc58fd9213\",\"fen\":\"5bNr/2RB2k1/2PPK1b1/8/2n1pPQ1/8/2q4r/8 b - - 0 1\",\"line_san\":\"1...Qd2?? 2.Qxg6+!! Kxg6 3.Be8#\",\"generator_seed\":2437516117,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('N', 0, 1), ('P', -4, -1), ('P', -3, -1), ('P', -1, -3), ('Q', 0, -3), ('R', -4, 0), ('b', -1, 1), ('b', 0, -1), ('k', 0, 0), ('n', -4, -3), ('p', -2, -3), ('q', -4, -5), ('r', 1, -5), ('r', 1, 1))\",\"solution_key\":\"san:Qd2 Qxg6 Kxg6 Be8\",\"answer_key\":\"answer:Qxg6 Kxg6 Be8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxd6#\",\"threat_uci\":\"d2d6\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers f6, f7 in the mate net.\",\"material_note\":\"added rh2; material 1 -> 6; eval -390 -> +487 cp\",\"force_notes\":[\"Only Qxg6+ meets the threat cleanly; 17 quiet moves still lose immediately.\",\"Non-direct tries checked: Qd1.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxd6#\",\"THREAT_UCI: d2d6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers f6, f7 in the mate net.\",\"MATERIAL: added rh2; material 1 -> 6; eval -390 -> +487 cp\",\"FORCE: Only Qxg6+ meets the threat cleanly; 17 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Qd1.\",\"NOTE 2: Kxg6 forced\"]}","created_at":"2026-07-09 17:58:27","_table":"pcp_chess_puzzles"},{"id":210,"puzzle_hash":"e3b5cb4afdc1a9c46c7ecee65194adb02ab55863389a7ec1fd9e1904a7218f83","fen":"1R1B2q1/8/2Q1p1n1/8/4K3/2bP4/3kp3/1B1br3 b - - 0 1","line_san":"1...Rf1?? 2.Qxc3+!! Kxc3 3.Ba5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens e1=R#","material_note":"added qg8; material -5 -> 4; eval -99995 -> +879 cp","payload":"{\"puzzle_hash\":\"e3b5cb4afdc1a9c46c7ecee65194adb02ab55863389a7ec1fd9e1904a7218f83\",\"fen\":\"1R1B2q1/8/2Q1p1n1/8/4K3/2bP4/3kp3/1B1br3 b - - 0 1\",\"line_san\":\"1...Rf1?? 2.Qxc3+!! Kxc3 3.Ba5#\",\"generator_seed\":3970211273,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, 0), ('B', 1, -2), ('K', -2, 1), ('P', -1, 0), ('Q', -4, -1), ('R', -6, -2), ('b', -1, -1), ('b', 1, 0), ('k', 0, 0), ('n', -4, 3), ('p', -4, 1), ('p', 0, 1), ('q', -6, 3), ('r', 1, 1))\",\"solution_key\":\"san:Rf1 Qxc3 Kxc3 Ba5\",\"answer_key\":\"answer:Qxc3 Kxc3 Ba5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens e1=R#\",\"threat_uci\":\"e2e1r\",\"threat_piece\":\"P=R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d3, e3 in the mate net.\",\"material_note\":\"added qg8; material -5 -> 4; eval -99995 -> +879 cp\",\"force_notes\":[\"Only Qxc3+ wins; 31 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens e1=R#\",\"THREAT_UCI: e2e1r\",\"THREAT_PIECE: P=R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d3, e3 in the mate net.\",\"MATERIAL: added qg8; material -5 -> 4; eval -99995 -> +879 cp\",\"FORCE: Only Qxc3+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: Kxc3 forced\"]}","created_at":"2026-07-09 04:38:59","_table":"pcp_chess_puzzles"},{"id":208,"puzzle_hash":"00007afd7ffdf08975b73ea8f89d3c458e76cff2896a19985bd513f5f148f055","fen":"7b/r4q1r/2RQPp2/8/Bp3K1p/3b1N2/1P2kp2/5n1n b - - 0 1","line_san":"1...Qg7?? 2.Qxd3+!! Kxd3 3.Bb5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qg3#","material_note":"added nh1, bh8, ph4, rh7, pb4, ra7; material -5 -> 13; eval -912 -> +240 cp","payload":"{\"puzzle_hash\":\"00007afd7ffdf08975b73ea8f89d3c458e76cff2896a19985bd513f5f148f055\",\"fen\":\"7b/r4q1r/2RQPp2/8/Bp3K1p/3b1N2/1P2kp2/5n1n b - - 0 1\",\"line_san\":\"1...Qg7?? 2.Qxd3+!! Kxd3 3.Bb5#\",\"generator_seed\":3384711575,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('K', 1, -2), ('N', 1, -1), ('P', -3, 0), ('P', 0, -4), ('Q', -1, -4), ('R', -2, -4), ('b', -1, -1), ('b', 3, -6), ('k', 0, 0), ('n', 1, 1), ('n', 3, 1), ('p', -3, -2), ('p', 1, -4), ('p', 1, 0), ('p', 3, -2), ('q', 1, -5), ('r', -4, -5), ('r', 3, -5))\",\"solution_key\":\"san:Qg7 Qxd3 Kxd3 Bb5\",\"answer_key\":\"answer:Qxd3 Kxd3 Bb5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qg3#\",\"threat_uci\":\"g7g3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e3, f3 in the mate net.\",\"material_note\":\"added nh1, bh8, ph4, rh7, pb4, ra7; material -5 -> 13; eval -912 -> +240 cp\",\"force_notes\":[\"Only Qxd3+ wins; 29 quiet moves allow mate in 1.\",\"5 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg3#\",\"THREAT_UCI: g7g3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e3, f3 in the mate net.\",\"MATERIAL: added nh1, bh8, ph4, rh7, pb4, ra7; material -5 -> 13; eval -912 -> +240 cp\",\"FORCE: Only Qxd3+ wins; 29 quiet moves allow mate in 1.\",\"FORCE: 5 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd3 forced\"]}","created_at":"2026-07-08 23:54:07","_table":"pcp_chess_puzzles"},{"id":207,"puzzle_hash":"678a7872c1a24d11572e90e881d2b88bf60396305a727f87f1e8dc0bf2143e7b","fen":"8/q5b1/4Q3/1r6/5Rp1/1Bp5/1PK1bP2/4k1B1 b - - 0 1","line_san":"1...Qa1?? 2.Qxe2+!! Kxe2 3.Bc4+ Ke1 4.Re4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxb2#","material_note":"added rb5, pg4; material -6 -> 0; eval -435 -> +527 cp","payload":"{\"puzzle_hash\":\"678a7872c1a24d11572e90e881d2b88bf60396305a727f87f1e8dc0bf2143e7b\",\"fen\":\"8/q5b1/4Q3/1r6/5Rp1/1Bp5/1PK1bP2/4k1B1 b - - 0 1\",\"line_san\":\"1...Qa1?? 2.Qxe2+!! Kxe2 3.Bc4+ Ke1 4.Re4#\",\"generator_seed\":127945929,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('B', 2, 0), ('K', -2, -1), ('P', -3, -1), ('P', 1, -1), ('Q', 0, -5), ('R', 1, -3), ('b', 0, -1), ('b', 2, -6), ('k', 0, 0), ('p', -2, -2), ('p', 2, -3), ('q', -4, -6), ('r', -3, -4))\",\"solution_key\":\"san:Qa1 Qxe2 Kxe2 Bc4 Ke1 Re4\",\"answer_key\":\"answer:Qxe2 Kxe2 Bc4 Ke1 Re4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxb2#\",\"threat_uci\":\"a1b2\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers d1, d2 in the mate net.\",\"material_note\":\"added rb5, pg4; material -6 -> 0; eval -435 -> +527 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe2 forced\"},{\"ply\":4,\"text\":\"Ke1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxb2#\",\"THREAT_UCI: a1b2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers d1, d2 in the mate net.\",\"MATERIAL: added rb5, pg4; material -6 -> 0; eval -435 -> +527 cp\",\"NOTE 2: Kxe2 forced\",\"NOTE 4: Ke1 forced\"]}","created_at":"2026-07-08 23:51:50","_table":"pcp_chess_puzzles"},{"id":206,"puzzle_hash":"91361b5eb81b7ed7e0bccfd2173a7bf77fb6ebe1dc9fd36f19593f5f5b640b75","fen":"2b5/5n2/1q1n2RQ/8/3p1KN1/5N1p/6k1/8 b - - 0 1","line_san":"1...Qb1?? 2.Qxh3+!! Kxh3 3.Nf2#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qe4#","material_note":"added bc8; material -3 -> 0; eval +40 -> +445 cp","payload":"{\"puzzle_hash\":\"91361b5eb81b7ed7e0bccfd2173a7bf77fb6ebe1dc9fd36f19593f5f5b640b75\",\"fen\":\"2b5/5n2/1q1n2RQ/8/3p1KN1/5N1p/6k1/8 b - - 0 1\",\"line_san\":\"1...Qb1?? 2.Qxh3+!! Kxh3 3.Nf2#\",\"generator_seed\":1736214149,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('K', -2, -1), ('N', -2, 0), ('N', -1, -1), ('Q', -4, 1), ('R', -4, 0), ('b', -6, -4), ('k', 0, 0), ('n', -5, -1), ('n', -4, -3), ('p', -2, -3), ('p', -1, 1), ('q', -4, -5))\",\"solution_key\":\"san:Qb1 Qxh3 Kxh3 Nf2\",\"answer_key\":\"answer:Qxh3 Kxh3 Nf2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qe4#\",\"threat_uci\":\"b1e4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f3, g3 in the mate net.\",\"material_note\":\"added bc8; material -3 -> 0; eval +40 -> +445 cp\",\"force_notes\":[\"Only Qxh3+ wins; 19 quiet moves allow mate in 1.\",\"7 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxh3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe4#\",\"THREAT_UCI: b1e4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f3, g3 in the mate net.\",\"MATERIAL: added bc8; material -3 -> 0; eval +40 -> +445 cp\",\"FORCE: Only Qxh3+ wins; 19 quiet moves allow mate in 1.\",\"FORCE: 7 checking tries do not solve the puzzle.\",\"NOTE 2: Kxh3 forced\"]}","created_at":"2026-07-08 18:39:16","_table":"pcp_chess_puzzles"},{"id":205,"puzzle_hash":"ea31adae0756ae458f539cbfa6ca6e53597b82bcd19b98cf35cae3c92fab0551","fen":"3B1R2/3k3B/1p2bQ2/8/np1KPp2/r2n4/6r1/8 b - - 0 1","line_san":"1...Rc2?? 2.Qxe6+!! Kxe6 3.Bf5+ Kd6 4.Rf6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rc4#","material_note":"added pb6, pb4; material -1 -> 1; eval -96 -> +141 cp","payload":"{\"puzzle_hash\":\"ea31adae0756ae458f539cbfa6ca6e53597b82bcd19b98cf35cae3c92fab0551\",\"fen\":\"3B1R2/3k3B/1p2bQ2/8/np1KPp2/r2n4/6r1/8 b - - 0 1\",\"line_san\":\"1...Rc2?? 2.Qxe6+!! Kxe6 3.Bf5+ Kd6 4.Rf6#\",\"generator_seed\":842940151,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, 0), ('B', 0, -1), ('K', 0, 3), ('P', -1, 3), ('Q', -2, 1), ('R', -2, -1), ('b', -1, 1), ('k', 0, 0), ('n', 0, 4), ('n', 3, 3), ('p', -2, 3), ('p', 2, 1), ('p', 2, 3), ('r', -3, 5), ('r', 3, 4))\",\"solution_key\":\"san:Rc2 Qxe6 Kxe6 Bf5 Kd6 Rf6\",\"answer_key\":\"answer:Qxe6 Kxe6 Bf5 Kd6 Rf6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rc4#\",\"threat_uci\":\"c2c4\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added pb6, pb4; material -1 -> 1; eval -96 -> +141 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe6 forced\"},{\"ply\":4,\"text\":\"Kd6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rc4#\",\"THREAT_UCI: c2c4\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added pb6, pb4; material -1 -> 1; eval -96 -> +141 cp\",\"NOTE 2: Kxe6 forced\",\"NOTE 4: Kd6 forced\"]}","created_at":"2026-07-08 18:33:25","_table":"pcp_chess_puzzles"},{"id":204,"puzzle_hash":"b30e2248bfeb66fac94c0c8529e4da5f8c4e89e4c4b5c0bc1fd24fc526ed6453","fen":"3N4/2R2p2/5pQ1/1q1bkP2/4p1Kp/5Pnr/8/4B1n1 b - - 0 1","line_san":"1...Qe2?? 2.Qxf6+!! Kxf6 3.Bc3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxf3#","material_note":"added pf7; material 4 -> 5; eval +66 -> +888 cp","payload":"{\"puzzle_hash\":\"b30e2248bfeb66fac94c0c8529e4da5f8c4e89e4c4b5c0bc1fd24fc526ed6453\",\"fen\":\"3N4/2R2p2/5pQ1/1q1bkP2/4p1Kp/5Pnr/8/4B1n1 b - - 0 1\",\"line_san\":\"1...Qe2?? 2.Qxf6+!! Kxf6 3.Bc3#\",\"generator_seed\":3995914134,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('K', -1, -2), ('N', 3, 1), ('P', -2, -1), ('P', 0, -1), ('Q', 1, -2), ('R', 2, 2), ('b', 0, 1), ('k', 0, 0), ('n', -4, -2), ('n', -2, -2), ('p', -1, -3), ('p', -1, 0), ('p', 1, -1), ('p', 2, -1), ('q', 0, 3), ('r', -2, -3))\",\"solution_key\":\"san:Qe2 Qxf6 Kxf6 Bc3\",\"answer_key\":\"answer:Qxf6 Kxf6 Bc3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxf3#\",\"threat_uci\":\"e2f3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers f4, f5 in the mate net.\",\"material_note\":\"added pf7; material 4 -> 5; eval +66 -> +888 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxf3#\",\"THREAT_UCI: e2f3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers f4, f5 in the mate net.\",\"MATERIAL: added pf7; material 4 -> 5; eval +66 -> +888 cp\",\"NOTE 2: Kxf6 forced\"]}","created_at":"2026-07-08 08:10:34","_table":"pcp_chess_puzzles"},{"id":203,"puzzle_hash":"325e0b7a04569cb77e3d908844d28e7c8a23203cd9c2880c3de03afd74feba9e","fen":"2q5/8/8/1n6/2bQR3/8/1KPn4/3kN3 b - - 0 1","line_san":"1...Qa6?? 2.Qxd2+!! Kxd2 3.Nf3+ Kd1 4.Re1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qa3#","material_note":null,"payload":"{\"puzzle_hash\":\"325e0b7a04569cb77e3d908844d28e7c8a23203cd9c2880c3de03afd74feba9e\",\"fen\":\"2q5/8/8/1n6/2bQR3/8/1KPn4/3kN3 b - - 0 1\",\"line_san\":\"1...Qa6?? 2.Qxd2+!! Kxd2 3.Nf3+ Kd1 4.Re1#\",\"generator_seed\":1748855202,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('K', -2, -1), ('N', 1, 0), ('P', -1, -1), ('Q', 0, -3), ('R', 1, -3), ('b', -1, -3), ('k', 0, 0), ('n', -2, -4), ('n', 0, -1), ('q', -1, -7))\",\"solution_key\":\"san:Qa6 Qxd2 Kxd2 Nf3 Kd1 Re1\",\"answer_key\":\"answer:Qxd2 Kxd2 Nf3 Kd1 Re1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qa3#\",\"threat_uci\":\"a6a3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c1, c2 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxd2+ meets the threat cleanly; 29 quiet moves still lose immediately.\",\"Non-direct tries checked: Qa7.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd2 forced\"},{\"ply\":4,\"text\":\"Kd1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qa3#\",\"THREAT_UCI: a6a3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c1, c2 in the mate net.\",\"FORCE: Only Qxd2+ meets the threat cleanly; 29 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Qa7.\",\"NOTE 2: Kxd2 forced\",\"NOTE 4: Kd1 forced\"]}","created_at":"2026-07-08 08:10:08","_table":"pcp_chess_puzzles"},{"id":202,"puzzle_hash":"8d9a730f1413c5727f7cf8a1b70f43a1e48a731ca2ca4dd6c92442efca36066f","fen":"8/8/6b1/6k1/1B2rpPb/3pnK2/6B1/3n3Q b - - 0 1","line_san":"1...Rd4?? 2.Qxh4+!! Kxh4 3.Be7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Be4#","material_note":null,"payload":"{\"puzzle_hash\":\"8d9a730f1413c5727f7cf8a1b70f43a1e48a731ca2ca4dd6c92442efca36066f\",\"fen\":\"8/8/6b1/6k1/1B2rpPb/3pnK2/6B1/3n3Q b - - 0 1\",\"line_san\":\"1...Rd4?? 2.Qxh4+!! Kxh4 3.Be7#\",\"generator_seed\":2360287917,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -5, -1), ('B', 0, -3), ('K', -1, -2), ('P', 0, -1), ('Q', 1, -4), ('b', 0, 1), ('b', 1, -1), ('k', 0, 0), ('n', -3, -4), ('n', -2, -2), ('p', -3, -2), ('p', -1, -1), ('r', -2, -1))\",\"solution_key\":\"san:Rd4 Qxh4 Kxh4 Be7\",\"answer_key\":\"answer:Qxh4 Kxh4 Be7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Be4#\",\"threat_uci\":\"g6e4\",\"threat_piece\":\"B\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f4, g4 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxh4+ wins; 16 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxh4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Be4#\",\"THREAT_UCI: g6e4\",\"THREAT_PIECE: B\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f4, g4 in the mate net.\",\"FORCE: Only Qxh4+ wins; 16 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxh4 forced\"]}","created_at":"2026-07-07 23:05:42","_table":"pcp_chess_puzzles"},{"id":201,"puzzle_hash":"43c01075d9d4521abc48a7b12ff6901c02555eda16f4784cbd2333cf44b0d8fe","fen":"1Q4R1/Ppr1b3/2kNK2n/2r1n3/8/8/8/8 b - - 0 1","line_san":"1...Ng6?? 2.Qxc7+!! Kxc7 3.a8=N+ Kc6 4.Rc8#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Re5#","material_note":null,"payload":"{\"puzzle_hash\":\"43c01075d9d4521abc48a7b12ff6901c02555eda16f4784cbd2333cf44b0d8fe\",\"fen\":\"1Q4R1/Ppr1b3/2kNK2n/2r1n3/8/8/8/8 b - - 0 1\",\"line_san\":\"1...Ng6?? 2.Qxc7+!! Kxc7 3.a8=N+ Kc6 4.Rc8#\",\"generator_seed\":578771916,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('K', -2, 0), ('N', -1, 0), ('P', 2, -1), ('Q', 1, -2), ('R', -4, -2), ('b', -2, -1), ('k', 0, 0), ('n', -5, 0), ('n', -2, 1), ('p', 1, -1), ('r', 0, -1), ('r', 0, 1))\",\"solution_key\":\"san:Ng6 Qxc7 Kxc7 a8=N Kc6 Rc8\",\"answer_key\":\"answer:Qxc7 Kxc7 a8=N Kc6 Rc8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Re5#\",\"threat_uci\":\"c5e5\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d5, d6, d7 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc7 forced\"},{\"ply\":4,\"text\":\"Kc6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Re5#\",\"THREAT_UCI: c5e5\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d5, d6, d7 in the mate net.\",\"NOTE 2: Kxc7 forced\",\"NOTE 4: Kc6 forced\"]}","created_at":"2026-07-07 22:54:19","_table":"pcp_chess_puzzles"},{"id":200,"puzzle_hash":"8e0e99dc2cb4af7912b71035d33cffbaf4a3f4213f303f04a6f31b5f6d315102","fen":"8/1b2n1p1/3p4/3k1nK1/q2Br2p/2P2Q1R/8/5B2 b - - 0 1","line_san":"1...Qe8?? 2.Qxe4+!! Kxe4 3.Bg2#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qg6#","material_note":"added pg7, bb7; material 1 -> 5; eval +2 -> +513 cp","payload":"{\"puzzle_hash\":\"8e0e99dc2cb4af7912b71035d33cffbaf4a3f4213f303f04a6f31b5f6d315102\",\"fen\":\"8/1b2n1p1/3p4/3k1nK1/q2Br2p/2P2Q1R/8/5B2 b - - 0 1\",\"line_san\":\"1...Qe8?? 2.Qxe4+!! Kxe4 3.Bg2#\",\"generator_seed\":83597613,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', -1, 0), ('K', 0, -3), ('P', -2, 1), ('Q', -2, -2), ('R', -2, -4), ('b', 2, 2), ('k', 0, 0), ('n', 0, -2), ('n', 2, -1), ('p', -1, -4), ('p', 1, 0), ('p', 2, -3), ('q', -1, 3), ('r', -1, -1))\",\"solution_key\":\"san:Qe8 Qxe4 Kxe4 Bg2\",\"answer_key\":\"answer:Qxe4 Kxe4 Bg2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qg6#\",\"threat_uci\":\"e8g6\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added pg7, bb7; material 1 -> 5; eval +2 -> +513 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg6#\",\"THREAT_UCI: e8g6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added pg7, bb7; material 1 -> 5; eval +2 -> +513 cp\",\"NOTE 2: Kxe4 forced\"]}","created_at":"2026-07-07 20:26:51","_table":"pcp_chess_puzzles"},{"id":199,"puzzle_hash":"a6ed3849c0d8b7141481dba284ebfc7420e8190c63d9162417e6e389cda813bb","fen":"8/3B4/2Q5/8/NR4n1/6p1/pPb1K1p1/2k3bq b - - 0 1","line_san":"1...Ba7?? 2.Qxc2+!! Kxc2 3.Bf5+ Kc1 4.Rc4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qf1#","material_note":"added pa2, pg3; material -2 -> 0; eval +99996 -> +99991 cp","payload":"{\"puzzle_hash\":\"a6ed3849c0d8b7141481dba284ebfc7420e8190c63d9162417e6e389cda813bb\",\"fen\":\"8/3B4/2Q5/8/NR4n1/6p1/pPb1K1p1/2k3bq b - - 0 1\",\"line_san\":\"1...Ba7?? 2.Qxc2+!! Kxc2 3.Bf5+ Kc1 4.Rc4#\",\"generator_seed\":3825280635,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, -1), ('K', -1, -2), ('N', -3, 2), ('P', -1, 1), ('Q', -5, 0), ('R', -3, 1), ('b', -1, 0), ('b', 0, -4), ('k', 0, 0), ('n', -3, -4), ('p', -2, -4), ('p', -1, -4), ('p', -1, 2), ('q', 0, -5))\",\"solution_key\":\"san:Ba7 Qxc2 Kxc2 Bf5 Kc1 Rc4\",\"answer_key\":\"answer:Qxc2 Kxc2 Bf5 Kc1 Rc4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qf1#\",\"threat_uci\":\"h1f1\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d1, d2 in the mate net.\",\"material_note\":\"added pa2, pg3; material -2 -> 0; eval +99996 -> +99991 cp\",\"force_notes\":[\"Only Qxc2+ meets the threat cleanly; 37 quiet moves still lose immediately.\",\"Non-direct tries checked: Kf3.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc2 forced\"},{\"ply\":4,\"text\":\"Kc1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qf1#\",\"THREAT_UCI: h1f1\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d1, d2 in the mate net.\",\"MATERIAL: added pa2, pg3; material -2 -> 0; eval +99996 -> +99991 cp\",\"FORCE: Only Qxc2+ meets the threat cleanly; 37 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Kf3.\",\"NOTE 2: Kxc2 forced\",\"NOTE 4: Kc1 forced\"]}","created_at":"2026-07-07 19:57:22","_table":"pcp_chess_puzzles"},{"id":198,"puzzle_hash":"72d4dc59c0cf6a46a9a2eceba21cb557d397b53acf6264496b31eb5cc620cf7c","fen":"3b4/1Pnkp1B1/N1r1p3/1Q2Kb2/4n1r1/1R6/8/8 b - - 0 1","line_san":"1...Ng5?? 2.Qxc6+!! Kxc6 3.b8=N#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Nf7#","material_note":null,"payload":"{\"puzzle_hash\":\"72d4dc59c0cf6a46a9a2eceba21cb557d397b53acf6264496b31eb5cc620cf7c\",\"fen\":\"3b4/1Pnkp1B1/N1r1p3/1Q2Kb2/4n1r1/1R6/8/8 b - - 0 1\",\"line_san\":\"1...Ng5?? 2.Qxc6+!! Kxc6 3.b8=N#\",\"generator_seed\":1474539732,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -1, -2), ('N', 3, -1), ('P', 2, 0), ('Q', 2, -2), ('R', 2, -4), ('b', -2, -2), ('b', 0, 1), ('k', 0, 0), ('n', -1, -3), ('n', 1, 0), ('p', -1, -1), ('p', -1, 0), ('r', -3, -3), ('r', 1, -1))\",\"solution_key\":\"san:Ng5 Qxc6 Kxc6 b8=N\",\"answer_key\":\"answer:Qxc6 Kxc6 b8=N\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Nf7#\",\"threat_uci\":\"g5f7\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d6, e6 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxc6+ wins; 26 quiet moves allow mate in 1.\",\"6 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: knight-promotion-mate\",\"THREAT: Black threatens Nf7#\",\"THREAT_UCI: g5f7\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d6, e6 in the mate net.\",\"FORCE: Only Qxc6+ wins; 26 quiet moves allow mate in 1.\",\"FORCE: 6 checking tries do not solve the puzzle.\",\"NOTE 2: Kxc6 forced\"]}","created_at":"2026-07-07 16:09:11","_table":"pcp_chess_puzzles"},{"id":197,"puzzle_hash":"bca79146888c13a180cd99dff025d7ac77aa78f7ad8cab7bc5a5a47ff4010161","fen":"6rr/2b5/5P2/5Kn1/1pk1N3/3n4/R4PB1/1Q5b b - - 0 1","line_san":"1...Rh4?? 2.Qxd3+!! Kxd3 3.Bf1+ Kd4 4.Rd2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rf4#","material_note":"added bc7, bh1; material -5 -> 1; eval -368 -> +218 cp","payload":"{\"puzzle_hash\":\"bca79146888c13a180cd99dff025d7ac77aa78f7ad8cab7bc5a5a47ff4010161\",\"fen\":\"6rr/2b5/5P2/5Kn1/1pk1N3/3n4/R4PB1/1Q5b b - - 0 1\",\"line_san\":\"1...Rh4?? 2.Qxd3+!! Kxd3 3.Bf1+ Kd4 4.Rd2#\",\"generator_seed\":1985011981,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -2), ('K', -3, 1), ('N', -2, 0), ('P', -3, -2), ('P', -3, 2), ('Q', 1, -3), ('R', 2, -2), ('b', -5, -3), ('b', 0, 3), ('k', 0, 0), ('n', -4, 1), ('n', -1, -1), ('p', 1, 0), ('r', -5, 4), ('r', -4, 4))\",\"solution_key\":\"san:Rh4 Qxd3 Kxd3 Bf1 Kd4 Rd2\",\"answer_key\":\"answer:Qxd3 Kxd3 Bf1 Kd4 Rd2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rf4#\",\"threat_uci\":\"h4f4\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added bc7, bh1; material -5 -> 1; eval -368 -> +218 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd3 forced\"},{\"ply\":4,\"text\":\"Kd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rf4#\",\"THREAT_UCI: h4f4\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added bc7, bh1; material -5 -> 1; eval -368 -> +218 cp\",\"NOTE 2: Kxd3 forced\",\"NOTE 4: Kd4 forced\"]}","created_at":"2026-07-07 15:17:19","_table":"pcp_chess_puzzles"},{"id":196,"puzzle_hash":"b38c43cd250bb6c29eb2bcb133b427cbb00a960447d3ca6ec824721316711027","fen":"8/3B3q/7p/3p1n2/5Kn1/2pkB1P1/4bQ2/R7 b - - 0 1","line_san":"1...Qe7?? 2.Qxe2+!! Kxe2 3.Bb5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qg5#","material_note":"added pd5; material -1 -> 0; eval +798 -> +731 cp","payload":"{\"puzzle_hash\":\"b38c43cd250bb6c29eb2bcb133b427cbb00a960447d3ca6ec824721316711027\",\"fen\":\"8/3B3q/7p/3p1n2/5Kn1/2pkB1P1/4bQ2/R7 b - - 0 1\",\"line_san\":\"1...Qe7?? 2.Qxe2+!! Kxe2 3.Bb5#\",\"generator_seed\":1338508941,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('B', 0, -1), ('K', -1, -2), ('P', 0, -3), ('Q', 1, -2), ('R', 2, 3), ('b', 1, -1), ('k', 0, 0), ('n', -2, -2), ('n', -1, -3), ('p', -3, -4), ('p', -2, 0), ('p', 0, 1), ('q', -4, -4))\",\"solution_key\":\"san:Qe7 Qxe2 Kxe2 Bb5\",\"answer_key\":\"answer:Qxe2 Kxe2 Bb5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qg5#\",\"threat_uci\":\"e7g5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e3, e4 in the mate net.\",\"material_note\":\"added pd5; material -1 -> 0; eval +798 -> +731 cp\",\"force_notes\":[\"Only Qxe2+ wins; 31 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe2 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg5#\",\"THREAT_UCI: e7g5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e3, e4 in the mate net.\",\"MATERIAL: added pd5; material -1 -> 0; eval +798 -> +731 cp\",\"FORCE: Only Qxe2+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe2 forced\"]}","created_at":"2026-07-07 09:30:34","_table":"pcp_chess_puzzles"},{"id":195,"puzzle_hash":"df9eedd024199902a0126309a48cf38f73cc072e56e2447dc00ce23fb81e569d","fen":"7Q/3r4/3n4/3p2R1/1b1r1P2/1Kpk1BB1/8/4n3 b - - 0 1","line_san":"1...Ra7?? 2.Qxd4+!! Kxd4 3.Bf2+ Kd3 4.Rxd5#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Ra3#","material_note":null,"payload":"{\"puzzle_hash\":\"df9eedd024199902a0126309a48cf38f73cc072e56e2447dc00ce23fb81e569d\",\"fen\":\"7Q/3r4/3n4/3p2R1/1b1r1P2/1Kpk1BB1/8/4n3 b - - 0 1\",\"line_san\":\"1...Ra7?? 2.Qxd4+!! Kxd4 3.Bf2+ Kd3 4.Rxd5#\",\"generator_seed\":3064993954,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, 0), ('B', -2, 0), ('K', 2, 0), ('P', -2, -1), ('Q', -4, -5), ('R', -3, -2), ('b', 2, -1), ('k', 0, 0), ('n', -1, 2), ('n', 0, -3), ('p', 0, -2), ('p', 1, 0), ('r', 0, -4), ('r', 0, -1))\",\"solution_key\":\"san:Ra7 Qxd4 Kxd4 Bf2 Kd3 Rxd5\",\"answer_key\":\"answer:Qxd4 Kxd4 Bf2 Kd3 Rxd5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Ra3#\",\"threat_uci\":\"a7a3\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c2, c3, c4 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxd4+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"Non-direct tries checked: Qa8.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"},{\"ply\":4,\"text\":\"Kd3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ra3#\",\"THREAT_UCI: a7a3\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c2, c3, c4 in the mate net.\",\"FORCE: Only Qxd4+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Qa8.\",\"NOTE 2: Kxd4 forced\",\"NOTE 4: Kd3 forced\"]}","created_at":"2026-07-07 09:25:11","_table":"pcp_chess_puzzles"},{"id":194,"puzzle_hash":"3bbe2f09b5917c964c35d86333a23673ce62171a291f20d7d9155525eb58e19f","fen":"Q7/8/4p1N1/n3p2R/3Nr3/p1P1k2b/2K1pb2/2n1r3 b - - 0 1","line_san":"1...Ncb3?? 2.Qxe4+!! Kxe4 3.Rxe5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rc1#","material_note":"added bh3, pe6; material 1 -> 5; eval -174 -> +215 cp","payload":"{\"puzzle_hash\":\"3bbe2f09b5917c964c35d86333a23673ce62171a291f20d7d9155525eb58e19f\",\"fen\":\"Q7/8/4p1N1/n3p2R/3Nr3/p1P1k2b/2K1pb2/2n1r3 b - - 0 1\",\"line_san\":\"1...Ncb3?? 2.Qxe4+!! Kxe4 3.Rxe5#\",\"generator_seed\":3885055222,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('K', -2, -1), ('N', -1, 1), ('N', 2, 3), ('P', -2, 0), ('Q', -4, 5), ('R', 3, 2), ('b', 1, -1), ('b', 3, 0), ('k', 0, 0), ('n', -4, 2), ('n', -2, -2), ('p', -4, 0), ('p', 0, -1), ('p', 0, 2), ('p', 0, 3), ('r', 0, -2), ('r', 0, 1))\",\"solution_key\":\"san:Ncb3 Qxe4 Kxe4 Rxe5\",\"answer_key\":\"answer:Qxe4 Kxe4 Rxe5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rc1#\",\"threat_uci\":\"e1c1\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, d3 in the mate net.\",\"material_note\":\"added bh3, pe6; material 1 -> 5; eval -174 -> +215 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rc1#\",\"THREAT_UCI: e1c1\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, d3 in the mate net.\",\"MATERIAL: added bh3, pe6; material 1 -> 5; eval -174 -> +215 cp\",\"NOTE 2: Kxe4 forced\"]}","created_at":"2026-07-07 01:13:53","_table":"pcp_chess_puzzles"},{"id":193,"puzzle_hash":"b33cd6c730bba41f341fdcf0ddc915d303d7e0c741b90c2831eb75983bba1cfa","fen":"8/4B3/3Q2R1/b5P1/4Nr2/np1K1kqB/8/1n6 b - - 0 1","line_san":"1...Qe1?? 2.Qxf4+!! Kxf4 3.Bd6+ Kf3 4.Rf6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qe3#","material_note":"added nb1, pb3; material -4 -> 0; eval +25 -> +456 cp","payload":"{\"puzzle_hash\":\"b33cd6c730bba41f341fdcf0ddc915d303d7e0c741b90c2831eb75983bba1cfa\",\"fen\":\"8/4B3/3Q2R1/b5P1/4Nr2/np1K1kqB/8/1n6 b - - 0 1\",\"line_san\":\"1...Qe1?? 2.Qxf4+!! Kxf4 3.Bd6+ Kf3 4.Rf6#\",\"generator_seed\":2014207265,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -1), ('B', 0, 2), ('K', 0, -2), ('N', -1, -1), ('P', -2, 1), ('Q', -3, -2), ('R', -3, 1), ('b', -2, -5), ('k', 0, 0), ('n', 0, -5), ('n', 2, -4), ('p', 0, -4), ('q', 0, 1), ('r', -1, 0))\",\"solution_key\":\"san:Qe1 Qxf4 Kxf4 Bd6 Kf3 Rf6\",\"answer_key\":\"answer:Qxf4 Kxf4 Bd6 Kf3 Rf6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qe3#\",\"threat_uci\":\"e1e3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e2, e3, e4 in the mate net.\",\"material_note\":\"added nb1, pb3; material -4 -> 0; eval +25 -> +456 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf4 forced\"},{\"ply\":4,\"text\":\"Kf3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe3#\",\"THREAT_UCI: e1e3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e2, e3, e4 in the mate net.\",\"MATERIAL: added nb1, pb3; material -4 -> 0; eval +25 -> +456 cp\",\"NOTE 2: Kxf4 forced\",\"NOTE 4: Kf3 forced\"]}","created_at":"2026-07-07 01:07:35","_table":"pcp_chess_puzzles"},{"id":192,"puzzle_hash":"85d5231a496711b511ca4c152f9badddc5f69b5014f3270e3a5a5a742e4443d0","fen":"4q3/1Q6/7R/1bPpr3/k2Kn1B1/r1Bn4/8/8 b - - 0 1","line_san":"1...Qf8?? 2.Qxb5+!! Kxb5 3.Bd7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxc5#","material_note":null,"payload":"{\"puzzle_hash\":\"85d5231a496711b511ca4c152f9badddc5f69b5014f3270e3a5a5a742e4443d0\",\"fen\":\"4q3/1Q6/7R/1bPpr3/k2Kn1B1/r1Bn4/8/8 b - - 0 1\",\"line_san\":\"1...Qf8?? 2.Qxb5+!! Kxb5 3.Bd7#\",\"generator_seed\":4143489760,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, 0), ('B', -2, -1), ('K', -3, 0), ('P', -2, 1), ('Q', -1, 3), ('R', -7, 2), ('b', -1, 1), ('k', 0, 0), ('n', -4, 0), ('n', -3, -1), ('p', -3, 1), ('q', -4, 4), ('r', -4, 1), ('r', 0, -1))\",\"solution_key\":\"san:Qf8 Qxb5 Kxb5 Bd7\",\"answer_key\":\"answer:Qxb5 Kxb5 Bd7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxc5#\",\"threat_uci\":\"f8c5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":null,\"material_note\":null,\"force_notes\":[\"Only Qxb5+ wins; 40 quiet moves allow mate in 1.\",\"5 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxc5#\",\"THREAT_UCI: f8c5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"FORCE: Only Qxb5+ wins; 40 quiet moves allow mate in 1.\",\"FORCE: 5 checking tries do not solve the puzzle.\",\"NOTE 2: Kxb5 forced\"]}","created_at":"2026-07-07 00:07:59","_table":"pcp_chess_puzzles"},{"id":191,"puzzle_hash":"8419f8277d9ed0e5008598f987662b4992086224bc0735288576cb8139c353c7","fen":"7Q/8/6RB/3Br3/1qPk1n2/r2pnK2/6P1/4b3 b - - 0 1","line_san":"1...Qd2?? 2.Qxe5+!! Kxe5 3.Bg7+ Kf5 4.Be4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qf2#","material_note":null,"payload":"{\"puzzle_hash\":\"8419f8277d9ed0e5008598f987662b4992086224bc0735288576cb8139c353c7\",\"fen\":\"7Q/8/6RB/3Br3/1qPk1n2/r2pnK2/6P1/4b3 b - - 0 1\",\"line_san\":\"1...Qd2?? 2.Qxe5+!! Kxe5 3.Bg7+ Kf5 4.Be4#\",\"generator_seed\":1152248984,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -2), ('B', 0, -1), ('K', -2, 1), ('P', -3, 2), ('P', 1, 0), ('Q', -4, -4), ('R', -3, -2), ('b', -1, 3), ('k', 0, 0), ('n', -2, 0), ('n', -1, 1), ('p', 0, 1), ('q', 2, 0), ('r', -1, -1), ('r', 3, 1))\",\"solution_key\":\"san:Qd2 Qxe5 Kxe5 Bg7 Kf5 Be4\",\"answer_key\":\"answer:Qxe5 Kxe5 Bg7 Kf5 Be4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qf2#\",\"threat_uci\":\"d2f2\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e3, e4 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"If Kc5, Bf8#\"},{\"ply\":4,\"text\":\"Kf5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qf2#\",\"THREAT_UCI: d2f2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e3, e4 in the mate net.\",\"NOTE 2: If Kc5, Bf8#\",\"NOTE 4: Kf5 forced\"]}","created_at":"2026-07-07 00:07:33","_table":"pcp_chess_puzzles"},{"id":190,"puzzle_hash":"f5566e23fe4359c41797927f14b1d47eada1fed1f71c3694136b519bb04f1080","fen":"8/3r1q2/5n2/1pPp2p1/3K1kP1/2P1Nb1p/R7/5Q1N b - - 0 1","line_san":"1...Qe6?? 2.Qxf3+!! Kxf3 3.Rf2#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxe3#","material_note":"added rd7, pb5, ph3; material -6 -> 1; eval -616 -> +676 cp","payload":"{\"puzzle_hash\":\"f5566e23fe4359c41797927f14b1d47eada1fed1f71c3694136b519bb04f1080\",\"fen\":\"8/3r1q2/5n2/1pPp2p1/3K1kP1/2P1Nb1p/R7/5Q1N b - - 0 1\",\"line_san\":\"1...Qe6?? 2.Qxf3+!! Kxf3 3.Rf2#\",\"generator_seed\":135916280,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('K', -2, 0), ('N', -1, -1), ('N', 2, -3), ('P', -3, -1), ('P', -3, 1), ('P', 1, 0), ('Q', 0, -3), ('R', -5, -2), ('b', 0, -1), ('k', 0, 0), ('n', 0, 2), ('p', -4, 1), ('p', -2, 1), ('p', 1, 1), ('p', 2, -1), ('q', 0, 3), ('r', -2, 3))\",\"solution_key\":\"san:Qe6 Qxf3 Kxf3 Rf2\",\"answer_key\":\"answer:Qxf3 Kxf3 Rf2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxe3#\",\"threat_uci\":\"e6e3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e3, e4, e5 in the mate net.\",\"material_note\":\"added rd7, pb5, ph3; material -6 -> 1; eval -616 -> +676 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxe3#\",\"THREAT_UCI: e6e3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e3, e4, e5 in the mate net.\",\"MATERIAL: added rd7, pb5, ph3; material -6 -> 1; eval -616 -> +676 cp\",\"NOTE 2: Kxf3 forced\"]}","created_at":"2026-07-06 19:28:11","_table":"pcp_chess_puzzles"},{"id":189,"puzzle_hash":"8a562da839c831e0c23ce30e16fe48a80fed5e37a77ef8f5f76b7d8843e5cd3e","fen":"8/5n2/Q1Bp1p1p/3P3p/1B1k1Kb1/1p1r1n2/R7/b5r1 b - - 0 1","line_san":"1...Nh4?? 2.Qxd3+!! Kxd3 3.Bb5+ Kd4 4.Rd2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rf3#","material_note":"added ba1, ph6, pf6, ph5, pd6, pb3; material -2 -> 6; eval -99990 -> +189 cp","payload":"{\"puzzle_hash\":\"8a562da839c831e0c23ce30e16fe48a80fed5e37a77ef8f5f76b7d8843e5cd3e\",\"fen\":\"8/5n2/Q1Bp1p1p/3P3p/1B1k1Kb1/1p1r1n2/R7/b5r1 b - - 0 1\",\"line_san\":\"1...Nh4?? 2.Qxd3+!! Kxd3 3.Bb5+ Kd4 4.Rd2#\",\"generator_seed\":3866639854,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -2, -1), ('B', 0, -2), ('K', 0, 2), ('P', -1, 0), ('Q', -2, -3), ('R', 2, -3), ('b', 0, 3), ('b', 3, -3), ('k', 0, 0), ('n', -3, 2), ('n', 1, 2), ('p', -2, 0), ('p', -2, 2), ('p', -2, 4), ('p', -1, 4), ('p', 1, -2), ('r', 1, 0), ('r', 3, 3))\",\"solution_key\":\"san:Nh4 Qxd3 Kxd3 Bb5 Kd4 Rd2\",\"answer_key\":\"answer:Qxd3 Kxd3 Bb5 Kd4 Rd2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rf3#\",\"threat_uci\":\"d3f3\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e3, e4, e5 in the mate net.\",\"material_note\":\"added ba1, ph6, pf6, ph5, pd6, pb3; material -2 -> 6; eval -99990 -> +189 cp\",\"force_notes\":[\"Only Qxd3+ wins; 29 quiet moves allow mate in 1.\",\"5 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd3 forced\"},{\"ply\":4,\"text\":\"Kd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rf3#\",\"THREAT_UCI: d3f3\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e3, e4, e5 in the mate net.\",\"MATERIAL: added ba1, ph6, pf6, ph5, pd6, pb3; material -2 -> 6; eval -99990 -> +189 cp\",\"FORCE: Only Qxd3+ wins; 29 quiet moves allow mate in 1.\",\"FORCE: 5 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd3 forced\",\"NOTE 4: Kd4 forced\"]}","created_at":"2026-07-06 19:26:25","_table":"pcp_chess_puzzles"},{"id":188,"puzzle_hash":"eda9a25c24a1ce1458554752ec78687424c84bb11399abeaa62a88ad8c187efe","fen":"8/4B3/3Q4/7R/5r2/2pKn1kP/3N2p1/1n3rq1 b - - 0 1","line_san":"1...Rd1?? 2.Qxf4+!! Kxf4 3.Bd6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rxd2#","material_note":null,"payload":"{\"puzzle_hash\":\"eda9a25c24a1ce1458554752ec78687424c84bb11399abeaa62a88ad8c187efe\",\"fen\":\"8/4B3/3Q4/7R/5r2/2pKn1kP/3N2p1/1n3rq1 b - - 0 1\",\"line_san\":\"1...Rd1?? 2.Qxf4+!! Kxf4 3.Bd6#\",\"generator_seed\":1472064201,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('K', 0, -3), ('N', 1, -3), ('P', 0, 1), ('Q', -3, -3), ('R', -2, 1), ('k', 0, 0), ('n', 0, -2), ('n', 2, -5), ('p', 0, -4), ('p', 1, 0), ('q', 2, 0), ('r', -1, -1), ('r', 2, -1))\",\"solution_key\":\"san:Rd1 Qxf4 Kxf4 Bd6\",\"answer_key\":\"answer:Qxf4 Kxf4 Bd6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rxd2#\",\"threat_uci\":\"d1d2\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rxd2#\",\"THREAT_UCI: d1d2\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"NOTE 2: Kxf4 forced\"]}","created_at":"2026-07-06 17:19:08","_table":"pcp_chess_puzzles"},{"id":187,"puzzle_hash":"3fa8512cab460c1ac8d4df67680bc39e9fd053fa321f9c41c708310ba44fcfb1","fen":"4n3/4p2p/1R5N/Q5bk/4P3/3n1bK1/5BP1/3q4 b - - 0 1","line_san":"1...Qf1?? 2.Qxg5+!! Kxg5 3.Nf7+ Kh5 4.Rh6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxg2#","material_note":"added ne8, ph7, pe7; material -4 -> 1; eval -173 -> +710 cp","payload":"{\"puzzle_hash\":\"3fa8512cab460c1ac8d4df67680bc39e9fd053fa321f9c41c708310ba44fcfb1\",\"fen\":\"4n3/4p2p/1R5N/Q5bk/4P3/3n1bK1/5BP1/3q4 b - - 0 1\",\"line_san\":\"1...Qf1?? 2.Qxg5+!! Kxg5 3.Nf7+ Kh5 4.Rh6#\",\"generator_seed\":1019668603,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, -1), ('N', 1, 0), ('P', -3, -1), ('P', -1, -3), ('Q', 0, -7), ('R', 1, -6), ('b', -2, -2), ('b', 0, -1), ('k', 0, 0), ('n', -2, -4), ('n', 3, -3), ('p', 2, -3), ('p', 2, 0), ('q', -4, -4))\",\"solution_key\":\"san:Qf1 Qxg5 Kxg5 Nf7 Kh5 Rh6\",\"answer_key\":\"answer:Qxg5 Kxg5 Nf7 Kh5 Rh6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxg2#\",\"threat_uci\":\"f1g2\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers g4, h4 in the mate net.\",\"material_note\":\"added ne8, ph7, pe7; material -4 -> 1; eval -173 -> +710 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg5 forced\"},{\"ply\":4,\"text\":\"Kh5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxg2#\",\"THREAT_UCI: f1g2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers g4, h4 in the mate net.\",\"MATERIAL: added ne8, ph7, pe7; material -4 -> 1; eval -173 -> +710 cp\",\"NOTE 2: Kxg5 forced\",\"NOTE 4: Kh5 forced\"]}","created_at":"2026-07-06 17:12:56","_table":"pcp_chess_puzzles"},{"id":186,"puzzle_hash":"532034a73330651b2f65b03e018456c8c7ffdef1c23d65ae24b450866eeef16d","fen":"3r1b1r/4k1n1/2P1pnKp/2R5/2N5/8/4Q3/3B4 b - - 0 1","line_san":"1...Nf5?? 2.Qxe6+!! Kxe6 3.Re5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rg8#","material_note":null,"payload":"{\"puzzle_hash\":\"532034a73330651b2f65b03e018456c8c7ffdef1c23d65ae24b450866eeef16d\",\"fen\":\"3r1b1r/4k1n1/2P1pnKp/2R5/2N5/8/4Q3/3B4 b - - 0 1\",\"line_san\":\"1...Nf5?? 2.Qxe6+!! Kxe6 3.Re5#\",\"generator_seed\":1293258694,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, -1), ('K', -1, 2), ('N', -3, -2), ('P', -1, -2), ('Q', -5, 0), ('R', -2, -2), ('b', 1, 1), ('k', 0, 0), ('n', -1, 1), ('n', 0, 2), ('p', -1, 0), ('p', -1, 3), ('r', 1, -1), ('r', 1, 3))\",\"solution_key\":\"san:Nf5 Qxe6 Kxe6 Re5\",\"answer_key\":\"answer:Qxe6 Kxe6 Re5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rg8#\",\"threat_uci\":\"h8g8\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f6, f7 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxe6+ stops mate in 1; 33 other moves lose immediately.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rg8#\",\"THREAT_UCI: h8g8\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f6, f7 in the mate net.\",\"FORCE: Only Qxe6+ stops mate in 1; 33 other moves lose immediately.\",\"NOTE 2: Kxe6 forced\"]}","created_at":"2026-07-06 16:51:12","_table":"pcp_chess_puzzles"},{"id":185,"puzzle_hash":"e93c8cd1b9c2f8309beeee539f8ef68cfb24cf026d34af2fb111847bb6ba270d","fen":"8/8/q7/3n1p2/7b/p2p1KN1/R4QPk/6r1 b - - 0 1","line_san":"1...Qg6?? 2.Qxg1+!! Kxg1 3.Ra1+ Kh2 4.Rh1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qg4#","material_note":null,"payload":"{\"puzzle_hash\":\"e93c8cd1b9c2f8309beeee539f8ef68cfb24cf026d34af2fb111847bb6ba270d\",\"fen\":\"8/8/q7/3n1p2/7b/p2p1KN1/R4QPk/6r1 b - - 0 1\",\"line_san\":\"1...Qg6?? 2.Qxg1+!! Kxg1 3.Ra1+ Kh2 4.Rh1#\",\"generator_seed\":3680971952,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('K', -2, -1), ('N', -1, -1), ('P', -1, 0), ('Q', -2, 0), ('R', -7, 0), ('b', 0, -2), ('k', 0, 0), ('n', -4, -3), ('p', -7, -1), ('p', -4, -1), ('p', -2, -3), ('q', -7, -4), ('r', -1, 1))\",\"solution_key\":\"san:Qg6 Qxg1 Kxg1 Ra1 Kh2 Rh1\",\"answer_key\":\"answer:Qxg1 Kxg1 Ra1 Kh2 Rh1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qg4#\",\"threat_uci\":\"g6g4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g2, g3 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxg1+ meets the threat cleanly; 21 quiet moves still lose immediately.\",\"Non-direct tries checked: Qe1.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg1 forced\"},{\"ply\":4,\"text\":\"Kh2 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg4#\",\"THREAT_UCI: g6g4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g2, g3 in the mate net.\",\"FORCE: Only Qxg1+ meets the threat cleanly; 21 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Qe1.\",\"NOTE 2: Kxg1 forced\",\"NOTE 4: Kh2 forced\"]}","created_at":"2026-07-06 16:48:48","_table":"pcp_chess_puzzles"},{"id":184,"puzzle_hash":"4c51a9f18c0f45f1b4d7f8921e5ac732ad4800b42694c98753dc42994148efd0","fen":"4Qb2/1R3Pkp/4K1p1/6B1/2n5/4n3/8/2q5 b - - 0 1","line_san":"1...Qd1?? 2.Qxf8+!! Kxf8 3.Bh6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qd5#","material_note":null,"payload":"{\"puzzle_hash\":\"4c51a9f18c0f45f1b4d7f8921e5ac732ad4800b42694c98753dc42994148efd0\",\"fen\":\"4Qb2/1R3Pkp/4K1p1/6B1/2n5/4n3/8/2q5 b - - 0 1\",\"line_san\":\"1...Qd1?? 2.Qxf8+!! Kxf8 3.Bh6#\",\"generator_seed\":3680121544,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -2, 0), ('K', -1, -2), ('P', 0, -1), ('Q', 1, -2), ('R', 0, -5), ('b', 1, -1), ('k', 0, 0), ('n', -4, -2), ('n', -3, -4), ('p', -1, 0), ('p', 0, 1), ('q', -6, -4))\",\"solution_key\":\"san:Qd1 Qxf8 Kxf8 Bh6\",\"answer_key\":\"answer:Qxf8 Kxf8 Bh6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qd5#\",\"threat_uci\":\"d1d5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f6, f7 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxf8+ wins; 25 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd5#\",\"THREAT_UCI: d1d5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f6, f7 in the mate net.\",\"FORCE: Only Qxf8+ wins; 25 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: Kxf8 forced\"]}","created_at":"2026-07-06 13:16:29","_table":"pcp_chess_puzzles"},{"id":183,"puzzle_hash":"46e6ac0c3445296e64f9ca55058988fd09aa93651d8fe4dabc2aa76c050d0859","fen":"Q7/8/2n5/3r4/1Rp1r3/2Kn4/bBP5/1k6 b - - 0 1","line_san":"1...Re2?? 2.Qxa2+!! Kxa2 3.Ra4+ Kb1 4.Ra1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rxc2#","material_note":null,"payload":"{\"puzzle_hash\":\"46e6ac0c3445296e64f9ca55058988fd09aa93651d8fe4dabc2aa76c050d0859\",\"fen\":\"Q7/8/2n5/3r4/1Rp1r3/2Kn4/bBP5/1k6 b - - 0 1\",\"line_san\":\"1...Re2?? 2.Qxa2+!! Kxa2 3.Ra4+ Kb1 4.Ra1#\",\"generator_seed\":3406740576,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -1, 0), ('K', -2, -1), ('P', -1, -1), ('Q', -7, 1), ('R', -3, 0), ('b', -1, 1), ('k', 0, 0), ('n', -5, -1), ('n', -2, -2), ('p', -3, -1), ('r', -4, -2), ('r', -3, -3))\",\"solution_key\":\"san:Re2 Qxa2 Kxa2 Ra4 Kb1 Ra1\",\"answer_key\":\"answer:Qxa2 Kxa2 Ra4 Kb1 Ra1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rxc2#\",\"threat_uci\":\"e2c2\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers b2, c2 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxa2 forced\"},{\"ply\":4,\"text\":\"Kb1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rxc2#\",\"THREAT_UCI: e2c2\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers b2, c2 in the mate net.\",\"NOTE 2: Kxa2 forced\",\"NOTE 4: Kb1 forced\"]}","created_at":"2026-07-06 13:13:47","_table":"pcp_chess_puzzles"},{"id":182,"puzzle_hash":"0947f335905b80a8508ed2a1f794e813c76a631bd668bd795972838857887386","fen":"1B6/5n2/1QB5/N1r1P3/3k4/PK1p4/1bp5/2q5 b - - 0 1","line_san":"1...Qa1?? 2.Qxc5+!! Kxc5 3.Ba7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxa3#","material_note":"added nf7; material -1 -> 2; eval -311 -> +405 cp","payload":"{\"puzzle_hash\":\"0947f335905b80a8508ed2a1f794e813c76a631bd668bd795972838857887386\",\"fen\":\"1B6/5n2/1QB5/N1r1P3/3k4/PK1p4/1bp5/2q5 b - - 0 1\",\"line_san\":\"1...Qa1?? 2.Qxc5+!! Kxc5 3.Ba7#\",\"generator_seed\":3227297715,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', -2, -1), ('K', 1, -2), ('N', -1, -3), ('P', -1, 1), ('P', 1, -3), ('Q', -2, -2), ('b', 2, -2), ('k', 0, 0), ('n', -3, 2), ('p', 1, 0), ('p', 2, -1), ('q', 3, -1), ('r', -1, -1))\",\"solution_key\":\"san:Qa1 Qxc5 Kxc5 Ba7\",\"answer_key\":\"answer:Qxc5 Kxc5 Ba7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxa3#\",\"threat_uci\":\"a1a3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers c3, c4 in the mate net.\",\"material_note\":\"added nf7; material -1 -> 2; eval -311 -> +405 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxa3#\",\"THREAT_UCI: a1a3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers c3, c4 in the mate net.\",\"MATERIAL: added nf7; material -1 -> 2; eval -311 -> +405 cp\",\"NOTE 2: Kxc5 forced\"]}","created_at":"2026-07-06 07:58:07","_table":"pcp_chess_puzzles"},{"id":181,"puzzle_hash":"c09ecbe81a0c307e9f662f533f4b77e592d89c414e63961501f554be32f7184a","fen":"8/R6N/Q5bk/4P3/3np1KP/1r3Bb1/1q6/4n3 b - - 0 1","line_san":"1...Qh2?? 2.Qxg6+!! Kxg6 3.Nf8+ Kh6 4.Rh7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxh4#","material_note":"added ne1, pe4, rb3; material -4 -> 5; eval -143 -> +769 cp","payload":"{\"puzzle_hash\":\"c09ecbe81a0c307e9f662f533f4b77e592d89c414e63961501f554be32f7184a\",\"fen\":\"8/R6N/Q5bk/4P3/3np1KP/1r3Bb1/1q6/4n3 b - - 0 1\",\"line_san\":\"1...Qh2?? 2.Qxg6+!! Kxg6 3.Nf8+ Kh6 4.Rh7#\",\"generator_seed\":3968326681,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, -1), ('N', 1, 0), ('P', -2, 0), ('P', -1, -3), ('Q', 0, -7), ('R', 1, -7), ('b', -3, -1), ('b', 0, -1), ('k', 0, 0), ('n', -5, -3), ('n', -2, -4), ('p', -2, -3), ('q', -4, -6), ('r', -3, -6))\",\"solution_key\":\"san:Qh2 Qxg6 Kxg6 Nf8 Kh6 Rh7\",\"answer_key\":\"answer:Qxg6 Kxg6 Nf8 Kh6 Rh7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxh4#\",\"threat_uci\":\"h2h4\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers g5, h5 in the mate net.\",\"material_note\":\"added ne1, pe4, rb3; material -4 -> 5; eval -143 -> +769 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg6 forced\"},{\"ply\":4,\"text\":\"Kh6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxh4#\",\"THREAT_UCI: h2h4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers g5, h5 in the mate net.\",\"MATERIAL: added ne1, pe4, rb3; material -4 -> 5; eval -143 -> +769 cp\",\"NOTE 2: Kxg6 forced\",\"NOTE 4: Kh6 forced\"]}","created_at":"2026-07-06 07:51:26","_table":"pcp_chess_puzzles"},{"id":180,"puzzle_hash":"397aff32879d341ac47e3c99502a704bb9a54a30dab728c3a98ba0f7e58520e7","fen":"2b5/P1k3b1/2Bpr3/3Kp3/1N1n3r/4Q3/R2n4/8 b - - 0 1","line_san":"1...Nf5?? 2.Qb6+!! Kxb6 3.a8=N#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Ne7#","material_note":"added bg7; material 0 -> 3; eval -203 -> +110 cp","payload":"{\"puzzle_hash\":\"397aff32879d341ac47e3c99502a704bb9a54a30dab728c3a98ba0f7e58520e7\",\"fen\":\"2b5/P1k3b1/2Bpr3/3Kp3/1N1n3r/4Q3/R2n4/8 b - - 0 1\",\"line_san\":\"1...Nf5?? 2.Qb6+!! Kxb6 3.a8=N#\",\"generator_seed\":3437236999,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -1, 0), ('K', -2, -1), ('N', -3, 1), ('P', 0, 2), ('Q', -4, -2), ('R', -5, 2), ('b', 0, -4), ('b', 1, 0), ('k', 0, 0), ('n', -5, -1), ('n', -3, -1), ('p', -2, -2), ('p', -1, -1), ('r', -3, -5), ('r', -1, -2))\",\"solution_key\":\"san:Nf5 Qb6 Kxb6 a8=N\",\"answer_key\":\"answer:Qb6 Kxb6 a8=N\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Ne7#\",\"threat_uci\":\"f5e7\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c6, d6 in the mate net.\",\"material_note\":\"added bg7; material 0 -> 3; eval -203 -> +110 cp\",\"force_notes\":[\"Only Qb6+ meets the threat cleanly; 37 quiet moves still lose immediately.\",\"Non-direct tries checked: Bd7.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: knight-promotion-mate\",\"THREAT: Black threatens Ne7#\",\"THREAT_UCI: f5e7\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c6, d6 in the mate net.\",\"MATERIAL: added bg7; material 0 -> 3; eval -203 -> +110 cp\",\"FORCE: Only Qb6+ meets the threat cleanly; 37 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Bd7.\",\"NOTE 2: Kxb6 forced\"]}","created_at":"2026-07-06 07:42:44","_table":"pcp_chess_puzzles"},{"id":179,"puzzle_hash":"b6243d12020d79fdd3c448ae6e948804d3ac88c8738aad24a532b09232d1a000","fen":"3b4/5p1p/7p/qP1k1K2/3r1n2/5R2/1Q1N4/4B3 b - - 0 1","line_san":"1...Nh5?? 2.Qxd4+!! Kxd4 3.Bf2+ Kd5 4.Rd3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Ng7#","material_note":"added qa5, pf7, ph6; material -9 -> 2; eval -654 -> +125 cp","payload":"{\"puzzle_hash\":\"b6243d12020d79fdd3c448ae6e948804d3ac88c8738aad24a532b09232d1a000\",\"fen\":\"3b4/5p1p/7p/qP1k1K2/3r1n2/5R2/1Q1N4/4B3 b - - 0 1\",\"line_san\":\"1...Nh5?? 2.Qxd4+!! Kxd4 3.Bf2+ Kd5 4.Rd3#\",\"generator_seed\":1576933045,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -1), ('K', 0, -2), ('N', -3, 0), ('P', 0, 2), ('Q', -3, 2), ('R', -2, -2), ('b', 3, 0), ('k', 0, 0), ('n', -1, -2), ('p', 1, -4), ('p', 2, -4), ('p', 2, -2), ('q', 0, 3), ('r', -1, 0))\",\"solution_key\":\"san:Nh5 Qxd4 Kxd4 Bf2 Kd5 Rd3\",\"answer_key\":\"answer:Qxd4 Kxd4 Bf2 Kd5 Rd3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Ng7#\",\"threat_uci\":\"h5g7\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e4, e5, e6 in the mate net.\",\"material_note\":\"added qa5, pf7, ph6; material -9 -> 2; eval -654 -> +125 cp\",\"force_notes\":[\"Only Qxd4+ meets the threat cleanly; 25 quiet moves still lose immediately.\",\"Non-direct tries checked: Ne4.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"},{\"ply\":4,\"text\":\"Kd5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ng7#\",\"THREAT_UCI: h5g7\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e4, e5, e6 in the mate net.\",\"MATERIAL: added qa5, pf7, ph6; material -9 -> 2; eval -654 -> +125 cp\",\"FORCE: Only Qxd4+ meets the threat cleanly; 25 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Ne4.\",\"NOTE 2: Kxd4 forced\",\"NOTE 4: Kd5 forced\"]}","created_at":"2026-07-06 07:30:40","_table":"pcp_chess_puzzles"},{"id":178,"puzzle_hash":"5b794886b8ff9a4271633fbe87f8708ad944f4f43d970d5ac93dc91b34b6985d","fen":"8/pR6/4p2B/pPb4Q/1k2P3/qpNKn3/2P1P1r1/8 b - - 0 1","line_san":"1...Qb2?? 2.Qxc5+!! Kxc5 3.Bf8#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxc2#","material_note":"added pe6, pa7; material -2 -> 0; eval -7 -> +388 cp","payload":"{\"puzzle_hash\":\"5b794886b8ff9a4271633fbe87f8708ad944f4f43d970d5ac93dc91b34b6985d\",\"fen\":\"8/pR6/4p2B/pPb4Q/1k2P3/qpNKn3/2P1P1r1/8 b - - 0 1\",\"line_san\":\"1...Qb2?? 2.Qxc5+!! Kxc5 3.Bf8#\",\"generator_seed\":1102079642,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, -2), ('K', -2, 1), ('N', -1, 1), ('P', -3, 0), ('P', -3, 2), ('P', -1, 2), ('P', 0, -1), ('Q', -6, -1), ('R', 0, -3), ('b', -1, -1), ('k', 0, 0), ('n', -3, 1), ('p', -3, -2), ('p', 0, 1), ('p', 1, -3), ('p', 1, -1), ('q', 1, 1), ('r', -5, 2))\",\"solution_key\":\"san:Qb2 Qxc5 Kxc5 Bf8\",\"answer_key\":\"answer:Qxc5 Kxc5 Bf8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxc2#\",\"threat_uci\":\"b2c2\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers c3, c4 in the mate net.\",\"material_note\":\"added pe6, pa7; material -2 -> 0; eval -7 -> +388 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxc2#\",\"THREAT_UCI: b2c2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers c3, c4 in the mate net.\",\"MATERIAL: added pe6, pa7; material -2 -> 0; eval -7 -> +388 cp\",\"NOTE 2: Kxc5 forced\"]}","created_at":"2026-07-06 06:56:56","_table":"pcp_chess_puzzles"},{"id":177,"puzzle_hash":"8fe05654ea9d40dbdd123cc02eee505aaf8661b64298f0abd70a7dea55068a5e","fen":"2B5/1QR5/8/1p1r1P2/1Kpk1B2/2p4q/1p6/1r6 b - - 0 1","line_san":"1...Ra1?? 2.Qxd5+!! Kxd5 3.Bb7+ Kd4 4.Rd7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens b1=R#","material_note":"added qh3; material -7 -> 2; eval -576 -> +128 cp","payload":"{\"puzzle_hash\":\"8fe05654ea9d40dbdd123cc02eee505aaf8661b64298f0abd70a7dea55068a5e\",\"fen\":\"2B5/1QR5/8/1p1r1P2/1Kpk1B2/2p4q/1p6/1r6 b - - 0 1\",\"line_san\":\"1...Ra1?? 2.Qxd5+!! Kxd5 3.Bb7+ Kd4 4.Rd7#\",\"generator_seed\":3178664599,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -1), ('B', 0, 2), ('K', 0, -2), ('P', -1, 2), ('Q', -3, -2), ('R', -3, -1), ('k', 0, 0), ('p', -1, -2), ('p', 0, -1), ('p', 1, -1), ('p', 2, -2), ('q', 1, 4), ('r', -1, 0), ('r', 3, -2))\",\"solution_key\":\"san:Ra1 Qxd5 Kxd5 Bb7 Kd4 Rd7\",\"answer_key\":\"answer:Qxd5 Kxd5 Bb7 Kd4 Rd7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens b1=R#\",\"threat_uci\":\"b2b1r\",\"threat_piece\":\"P=R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c3, c4, c5 in the mate net.\",\"material_note\":\"added qh3; material -7 -> 2; eval -576 -> +128 cp\",\"force_notes\":[\"Only Qxd5+ wins; 22 quiet moves allow mate in 1.\",\"5 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd5 forced\"},{\"ply\":4,\"text\":\"Kd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens b1=R#\",\"THREAT_UCI: b2b1r\",\"THREAT_PIECE: P=R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c3, c4, c5 in the mate net.\",\"MATERIAL: added qh3; material -7 -> 2; eval -576 -> +128 cp\",\"FORCE: Only Qxd5+ wins; 22 quiet moves allow mate in 1.\",\"FORCE: 5 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd5 forced\",\"NOTE 4: Kd4 forced\"]}","created_at":"2026-07-06 06:55:59","_table":"pcp_chess_puzzles"},{"id":176,"puzzle_hash":"493ed925548b6845f7b94b0b8c1251141382a23393543cbfa1ac94c9f5930c4b","fen":"2kb2Q1/1pN5/3KPN2/4P3/n1b5/3nr2B/2q5/4r3 b - - 0 1","line_san":"1...Qb2?? 2.Qxd8+!! Kxd8 3.e7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxe5#","material_note":"added re1, re3, na4; material -1 -> 12; eval -99994 -> +886 cp","payload":"{\"puzzle_hash\":\"493ed925548b6845f7b94b0b8c1251141382a23393543cbfa1ac94c9f5930c4b\",\"fen\":\"2kb2Q1/1pN5/3KPN2/4P3/n1b5/3nr2B/2q5/4r3 b - - 0 1\",\"line_san\":\"1...Qb2?? 2.Qxd8+!! Kxd8 3.e7#\",\"generator_seed\":4082559116,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -5, -5), ('K', -2, -1), ('N', -2, -3), ('N', -1, 0), ('P', -3, -2), ('P', -2, -2), ('Q', 0, -4), ('b', -4, 0), ('b', 0, -1), ('k', 0, 0), ('n', -5, -1), ('n', -4, 2), ('p', -1, 1), ('q', -6, 0), ('r', -7, -2), ('r', -5, -2))\",\"solution_key\":\"san:Qb2 Qxd8 Kxd8 e7\",\"answer_key\":\"answer:Qxd8 Kxd8 e7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxe5#\",\"threat_uci\":\"b2e5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers c7, d7 in the mate net.\",\"material_note\":\"added re1, re3, na4; material -1 -> 12; eval -99994 -> +886 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: pawn-mate\",\"THREAT: Black threatens Qxe5#\",\"THREAT_UCI: b2e5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers c7, d7 in the mate net.\",\"MATERIAL: added re1, re3, na4; material -1 -> 12; eval -99994 -> +886 cp\",\"NOTE 2: Kxd8 forced\"]}","created_at":"2026-07-05 23:12:59","_table":"pcp_chess_puzzles"},{"id":175,"puzzle_hash":"6bea7610433510ccc4fffb54256c912e47e2b1ffa4c6a23fbed9e93c8ce4c3d7","fen":"8/N6R/kb5Q/3P4/PK1pn3/1bB3r1/6q1/3n4 b - - 0 1","line_san":"1...Qa2?? 2.Qxb6+!! Kxb6 3.Nc8+ Ka6 4.Ra7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxa4#","material_note":"added nd1, pd4, rg3; material -4 -> 5; eval -127 -> +759 cp","payload":"{\"puzzle_hash\":\"6bea7610433510ccc4fffb54256c912e47e2b1ffa4c6a23fbed9e93c8ce4c3d7\",\"fen\":\"8/N6R/kb5Q/3P4/PK1pn3/1bB3r1/6q1/3n4 b - - 0 1\",\"line_san\":\"1...Qa2?? 2.Qxb6+!! Kxb6 3.Nc8+ Ka6 4.Ra7#\",\"generator_seed\":1443150048,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, -1), ('N', 1, 0), ('P', -2, 0), ('P', -1, -3), ('Q', 0, -7), ('R', 1, -7), ('b', -3, -1), ('b', 0, -1), ('k', 0, 0), ('n', -5, -3), ('n', -2, -4), ('p', -2, -3), ('q', -4, -6), ('r', -3, -6))\",\"solution_key\":\"san:Qa2 Qxb6 Kxb6 Nc8 Ka6 Ra7\",\"answer_key\":\"answer:Qxb6 Kxb6 Nc8 Ka6 Ra7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxa4#\",\"threat_uci\":\"a2a4\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers a5, b5 in the mate net.\",\"material_note\":\"added nd1, pd4, rg3; material -4 -> 5; eval -127 -> +759 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb6 forced\"},{\"ply\":4,\"text\":\"Ka6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxa4#\",\"THREAT_UCI: a2a4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers a5, b5 in the mate net.\",\"MATERIAL: added nd1, pd4, rg3; material -4 -> 5; eval -127 -> +759 cp\",\"NOTE 2: Kxb6 forced\",\"NOTE 4: Ka6 forced\"]}","created_at":"2026-07-05 23:10:16","_table":"pcp_chess_puzzles"},{"id":174,"puzzle_hash":"592548893b50fe31748bc027e341bf10ee45844df600b24db5bcbdfd179e278c","fen":"2R5/8/1p6/4Q1B1/1pPnBKp1/1pk2bP1/8/5n1q b - - 0 1","line_san":"1...Qh2?? 2.Qxd4+!! Kxd4 3.Bf6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxg3#","material_note":"added pb6; material -1 -> 0; eval +800 -> +868 cp","payload":"{\"puzzle_hash\":\"592548893b50fe31748bc027e341bf10ee45844df600b24db5bcbdfd179e278c\",\"fen\":\"2R5/8/1p6/4Q1B1/1pPnBKp1/1pk2bP1/8/5n1q b - - 0 1\",\"line_san\":\"1...Qh2?? 2.Qxd4+!! Kxd4 3.Bf6#\",\"generator_seed\":3736261315,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', -2, -1), ('K', -3, -1), ('P', -4, 0), ('P', 0, -1), ('Q', -2, -2), ('R', 0, -5), ('b', -3, 0), ('k', 0, 0), ('n', -3, 2), ('n', -1, -1), ('p', -4, -1), ('p', 1, -3), ('p', 1, -1), ('p', 1, 0), ('q', -5, 2))\",\"solution_key\":\"san:Qh2 Qxd4 Kxd4 Bf6\",\"answer_key\":\"answer:Qxd4 Kxd4 Bf6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxg3#\",\"threat_uci\":\"h2g3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":null,\"material_note\":\"added pb6; material -1 -> 0; eval +800 -> +868 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxg3#\",\"THREAT_UCI: h2g3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"MATERIAL: added pb6; material -1 -> 0; eval +800 -> +868 cp\",\"NOTE 2: Kxd4 forced\"]}","created_at":"2026-07-05 19:45:47","_table":"pcp_chess_puzzles"},{"id":173,"puzzle_hash":"6a430581840f71afa005aa95d0230818a0fed3f39d46d2e36366c89e77a40bdf","fen":"b7/3B4/2Q4R/1Pb5/pk5B/1pnK4/4P3/qn6 b - - 0 1","line_san":"1...Qa2?? 2.Qxc5+!! Kxc5 3.Be7+ Kd5 4.Rh5#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxe2#","material_note":"added ba8; material -2 -> 1; eval -224 -> +99994 cp","payload":"{\"puzzle_hash\":\"6a430581840f71afa005aa95d0230818a0fed3f39d46d2e36366c89e77a40bdf\",\"fen\":\"b7/3B4/2Q4R/1Pb5/pk5B/1pnK4/4P3/qn6 b - - 0 1\",\"line_san\":\"1...Qa2?? 2.Qxc5+!! Kxc5 3.Be7+ Kd5 4.Rh5#\",\"generator_seed\":1867430246,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, 0), ('B', -2, -3), ('K', -2, 1), ('P', -3, 2), ('P', 0, -1), ('Q', -1, -2), ('R', -6, -2), ('b', -1, -1), ('b', 1, -4), ('k', 0, 0), ('n', -1, 1), ('n', 0, 3), ('p', 0, 1), ('p', 1, 0), ('q', 1, 3))\",\"solution_key\":\"san:Qa2 Qxc5 Kxc5 Be7 Kd5 Rh5\",\"answer_key\":\"answer:Qxc5 Kxc5 Be7 Kd5 Rh5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxe2#\",\"threat_uci\":\"a2e2\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers c3, c4 in the mate net.\",\"material_note\":\"added ba8; material -2 -> 1; eval -224 -> +99994 cp\",\"force_notes\":[\"Only Qxc5+ stops mate in 1; 38 other moves lose immediately.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Ka5, Bd8#\"},{\"ply\":4,\"text\":\"Kd5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxe2#\",\"THREAT_UCI: a2e2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers c3, c4 in the mate net.\",\"MATERIAL: added ba8; material -2 -> 1; eval -224 -> +99994 cp\",\"FORCE: Only Qxc5+ stops mate in 1; 38 other moves lose immediately.\",\"NOTE 2: If Ka5, Bd8#\",\"NOTE 4: Kd5 forced\"]}","created_at":"2026-07-05 19:28:32","_table":"pcp_chess_puzzles"},{"id":172,"puzzle_hash":"a5119a52bef49a2f2764172b3d043b6fee6c331190b77a9faf50e88da9bf76ec","fen":"r1BQ4/Pn2p3/1K3p2/P2bBP2/1pk5/1q1n4/4R3/8 b - - 0 1","line_san":"1...Qa4?? 2.Qxd5+!! Kxd5 3.Be6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxa5#","material_note":"added pe7, pf6; material 1 -> 3; eval -99 -> +327 cp","payload":"{\"puzzle_hash\":\"a5119a52bef49a2f2764172b3d043b6fee6c331190b77a9faf50e88da9bf76ec\",\"fen\":\"r1BQ4/Pn2p3/1K3p2/P2bBP2/1pk5/1q1n4/4R3/8 b - - 0 1\",\"line_san\":\"1...Qa4?? 2.Qxd5+!! Kxd5 3.Be6#\",\"generator_seed\":1829910307,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('B', -1, -2), ('K', -2, 1), ('P', -3, 2), ('P', -1, -3), ('P', -1, 2), ('Q', -4, -1), ('R', 2, -2), ('b', -1, -1), ('k', 0, 0), ('n', -3, 1), ('n', 1, -1), ('p', -3, -2), ('p', -2, -3), ('p', 0, 1), ('q', 1, 1), ('r', -4, 2))\",\"solution_key\":\"san:Qa4 Qxd5 Kxd5 Be6\",\"answer_key\":\"answer:Qxd5 Kxd5 Be6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxa5#\",\"threat_uci\":\"a4a5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers b5, c5 in the mate net.\",\"material_note\":\"added pe7, pf6; material 1 -> 3; eval -99 -> +327 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxa5#\",\"THREAT_UCI: a4a5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers b5, c5 in the mate net.\",\"MATERIAL: added pe7, pf6; material 1 -> 3; eval -99 -> +327 cp\",\"NOTE 2: Kxd5 forced\"]}","created_at":"2026-07-05 18:32:36","_table":"pcp_chess_puzzles"},{"id":171,"puzzle_hash":"59ebb5b5ef0b1501d7396c9b4d7278f304917e0cb68ef8e870b3bc3e2ec691ad","fen":"4Q3/3B4/8/8/6P1/rP6/1bKNb3/qn2k1B1 b - - 0 1","line_san":"1...Bc3?? 2.Qxe2+!! Kxe2 3.Bb5+ Ke1 4.Nf3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qb2#","material_note":null,"payload":"{\"puzzle_hash\":\"59ebb5b5ef0b1501d7396c9b4d7278f304917e0cb68ef8e870b3bc3e2ec691ad\",\"fen\":\"4Q3/3B4/8/8/6P1/rP6/1bKNb3/qn2k1B1 b - - 0 1\",\"line_san\":\"1...Bc3?? 2.Qxe2+!! Kxe2 3.Bb5+ Ke1 4.Nf3#\",\"generator_seed\":4143812982,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, -1), ('B', 0, 2), ('K', -1, -2), ('N', -1, -1), ('P', -3, 2), ('P', -2, -3), ('Q', -7, 0), ('b', -1, -3), ('b', -1, 0), ('k', 0, 0), ('n', 0, -3), ('q', 0, -4), ('r', -2, -4))\",\"solution_key\":\"san:Bc3 Qxe2 Kxe2 Bb5 Ke1 Nf3\",\"answer_key\":\"answer:Qxe2 Kxe2 Bb5 Ke1 Nf3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qb2#\",\"threat_uci\":\"a1b2\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d1, d2 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe2 forced\"},{\"ply\":4,\"text\":\"Ke1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qb2#\",\"THREAT_UCI: a1b2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d1, d2 in the mate net.\",\"NOTE 2: Kxe2 forced\",\"NOTE 4: Ke1 forced\"]}","created_at":"2026-07-05 18:18:18","_table":"pcp_chess_puzzles"},{"id":170,"puzzle_hash":"37c271676140333c3865b5d4bc011062305020a118a75def98cd4ab475bd22cc","fen":"5q2/6Pn/3p4/5p1p/5K1p/1B3n2/3Qb1P1/R3Bkr1 b - - 0 1","line_san":"1...Qf6?? 2.Qxe2+!! Kxe2 3.Bc4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qg5#","material_note":"added nh7, ph4, ph5; material 0 -> 5; eval -649 -> +155 cp","payload":"{\"puzzle_hash\":\"37c271676140333c3865b5d4bc011062305020a118a75def98cd4ab475bd22cc\",\"fen\":\"5q2/6Pn/3p4/5p1p/5K1p/1B3n2/3Qb1P1/R3Bkr1 b - - 0 1\",\"line_san\":\"1...Qf6?? 2.Qxe2+!! Kxe2 3.Bc4#\",\"generator_seed\":2513356812,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', -1, 0), ('K', 0, -3), ('P', 1, -6), ('P', 1, -1), ('Q', -2, -1), ('R', -5, 0), ('b', -1, -1), ('k', 0, 0), ('n', 0, -2), ('n', 2, -6), ('p', -2, -5), ('p', 0, -4), ('p', 2, -4), ('p', 2, -3), ('q', 0, -7), ('r', 1, 0))\",\"solution_key\":\"san:Qf6 Qxe2 Kxe2 Bc4\",\"answer_key\":\"answer:Qxe2 Kxe2 Bc4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qg5#\",\"threat_uci\":\"f6g5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added nh7, ph4, ph5; material 0 -> 5; eval -649 -> +155 cp\",\"force_notes\":[\"Only Qxe2+ wins; 40 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe2 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg5#\",\"THREAT_UCI: f6g5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added nh7, ph4, ph5; material 0 -> 5; eval -649 -> +155 cp\",\"FORCE: Only Qxe2+ wins; 40 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe2 forced\"]}","created_at":"2026-07-05 14:19:31","_table":"pcp_chess_puzzles"},{"id":169,"puzzle_hash":"03fb656fde79fc397c5825eb50025d44a7a014d587eb0bb517a1a21dc56a3fe2","fen":"8/5q1b/8/1Q4n1/3R1b2/5P2/2pPn1K1/3Nk1B1 b - - 0 1","line_san":"1...Qh5?? 2.Qxe2+!! Kxe2 3.Nc3+ Ke1 4.Bf2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qh3#","material_note":"added bh7, pc2; material -4 -> 0; eval -35 -> +440 cp","payload":"{\"puzzle_hash\":\"03fb656fde79fc397c5825eb50025d44a7a014d587eb0bb517a1a21dc56a3fe2\",\"fen\":\"8/5q1b/8/1Q4n1/3R1b2/5P2/2pPn1K1/3Nk1B1 b - - 0 1\",\"line_san\":\"1...Qh5?? 2.Qxe2+!! Kxe2 3.Nc3+ Ke1 4.Bf2#\",\"generator_seed\":2270632396,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -2, 0), ('K', -2, -1), ('N', 1, 0), ('P', -1, -2), ('P', 1, -1), ('Q', 3, -4), ('R', 1, -3), ('b', -3, -6), ('b', -1, -3), ('k', 0, 0), ('n', -2, -4), ('n', 0, -1), ('p', 2, -1), ('q', -1, -6))\",\"solution_key\":\"san:Qh5 Qxe2 Kxe2 Nc3 Ke1 Bf2\",\"answer_key\":\"answer:Qxe2 Kxe2 Nc3 Ke1 Bf2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qh3#\",\"threat_uci\":\"h5h3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f1, f2 in the mate net.\",\"material_note\":\"added bh7, pc2; material -4 -> 0; eval -35 -> +440 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe2 forced\"},{\"ply\":4,\"text\":\"Ke1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qh3#\",\"THREAT_UCI: h5h3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f1, f2 in the mate net.\",\"MATERIAL: added bh7, pc2; material -4 -> 0; eval -35 -> +440 cp\",\"NOTE 2: Kxe2 forced\",\"NOTE 4: Ke1 forced\"]}","created_at":"2026-07-05 14:18:51","_table":"pcp_chess_puzzles"},{"id":168,"puzzle_hash":"c4a83f1ae62f57c868179d070299da1a2bbb70f34e059da0e5c399360b06deb4","fen":"3bQ3/1pkP2p1/2p1Kp1n/2B1nr2/2BR4/8/8/1b6 b - - 0 1","line_san":"1...Nf3?? 2.Qxd8+!! Kxd8 3.Bb6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Ng5#","material_note":"added bb1, pg7; material -4 -> 0; eval +222 -> +536 cp","payload":"{\"puzzle_hash\":\"c4a83f1ae62f57c868179d070299da1a2bbb70f34e059da0e5c399360b06deb4\",\"fen\":\"3bQ3/1pkP2p1/2p1Kp1n/2B1nr2/2BR4/8/8/1b6 b - - 0 1\",\"line_san\":\"1...Nf3?? 2.Qxd8+!! Kxd8 3.Bb6#\",\"generator_seed\":2364752185,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('B', -2, 0), ('K', -1, -2), ('P', 0, -1), ('Q', 1, -2), ('R', -3, -1), ('b', -6, 1), ('b', 1, -1), ('k', 0, 0), ('n', -2, -2), ('n', -1, -5), ('p', -1, -3), ('p', -1, 0), ('p', 0, -4), ('p', 0, 1), ('r', -2, -3))\",\"solution_key\":\"san:Nf3 Qxd8 Kxd8 Bb6\",\"answer_key\":\"answer:Qxd8 Kxd8 Bb6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Ng5#\",\"threat_uci\":\"f3g5\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d6, d7 in the mate net.\",\"material_note\":\"added bb1, pg7; material -4 -> 0; eval +222 -> +536 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ng5#\",\"THREAT_UCI: f3g5\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d6, d7 in the mate net.\",\"MATERIAL: added bb1, pg7; material -4 -> 0; eval +222 -> +536 cp\",\"NOTE 2: Kxd8 forced\"]}","created_at":"2026-07-04 23:54:41","_table":"pcp_chess_puzzles"},{"id":167,"puzzle_hash":"c3f91dc4bef745e7f3d28997eaf02c5d00c0226b26e940f861836f4116a2af26","fen":"8/1B6/7q/n7/p1p1Qbp1/R3p3/P1p1K1n1/1k1N4 b - - 0 1","line_san":"1...Qh1?? 2.Qxc2+!! Kxc2 3.Be4+ Kc1 4.Rc3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qe1#","material_note":"added pa4, na5; material -2 -> 2; eval +364 -> +505 cp","payload":"{\"puzzle_hash\":\"c3f91dc4bef745e7f3d28997eaf02c5d00c0226b26e940f861836f4116a2af26\",\"fen\":\"8/1B6/7q/n7/p1p1Qbp1/R3p3/P1p1K1n1/1k1N4 b - - 0 1\",\"line_san\":\"1...Qh1?? 2.Qxc2+!! Kxc2 3.Be4+ Kc1 4.Rc3#\",\"generator_seed\":56980804,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, 0), ('K', -1, -3), ('N', 0, -2), ('P', -1, 1), ('Q', -3, -3), ('R', -2, 1), ('b', -3, -4), ('k', 0, 0), ('n', -4, 1), ('n', -1, -5), ('p', -3, -5), ('p', -3, -1), ('p', -3, 1), ('p', -2, -3), ('p', -1, -1), ('q', -5, -6))\",\"solution_key\":\"san:Qh1 Qxc2 Kxc2 Be4 Kc1 Rc3\",\"answer_key\":\"answer:Qxc2 Kxc2 Be4 Kc1 Rc3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qe1#\",\"threat_uci\":\"h1e1\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added pa4, na5; material -2 -> 2; eval +364 -> +505 cp\",\"force_notes\":[\"Only Qxc2+ wins; 28 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Ka1, Qb2#\"},{\"ply\":4,\"text\":\"Kc1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe1#\",\"THREAT_UCI: h1e1\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added pa4, na5; material -2 -> 2; eval +364 -> +505 cp\",\"FORCE: Only Qxc2+ wins; 28 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: If Ka1, Qb2#\",\"NOTE 4: Kc1 forced\"]}","created_at":"2026-07-04 23:53:48","_table":"pcp_chess_puzzles"},{"id":166,"puzzle_hash":"a6510f6fd24a2b0ff34ca735de19e24f9b1d93952e07d4526dfc921beeb4e889","fen":"8/2R5/4n1q1/6p1/2B1n3/1P2K1p1/1pkB4/3bQ3 b - - 0 1","line_san":"1...Qf6?? 2.Qxd1+!! Kxd1 3.Be2#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qd4#","material_note":"added pg3; material -1 -> 0; eval +377 -> +420 cp","payload":"{\"puzzle_hash\":\"a6510f6fd24a2b0ff34ca735de19e24f9b1d93952e07d4526dfc921beeb4e889\",\"fen\":\"8/2R5/4n1q1/6p1/2B1n3/1P2K1p1/1pkB4/3bQ3 b - - 0 1\",\"line_san\":\"1...Qf6?? 2.Qxd1+!! Kxd1 3.Be2#\",\"generator_seed\":3201366600,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -2, 0), ('B', 0, -1), ('K', -1, -2), ('P', -1, 1), ('Q', 1, -2), ('R', -5, 0), ('b', 1, -1), ('k', 0, 0), ('n', -4, -2), ('n', -2, -2), ('p', -3, -4), ('p', -1, -4), ('p', 0, 1), ('q', -4, -4))\",\"solution_key\":\"san:Qf6 Qxd1 Kxd1 Be2\",\"answer_key\":\"answer:Qxd1 Kxd1 Be2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qd4#\",\"threat_uci\":\"f6d4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, d3 in the mate net.\",\"material_note\":\"added pg3; material -1 -> 0; eval +377 -> +420 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd4#\",\"THREAT_UCI: f6d4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, d3 in the mate net.\",\"MATERIAL: added pg3; material -1 -> 0; eval +377 -> +420 cp\",\"NOTE 2: Kxd1 forced\"]}","created_at":"2026-07-04 20:27:27","_table":"pcp_chess_puzzles"},{"id":165,"puzzle_hash":"77ae04ba3a7d50c4203c56def9674336ac00383c630168f09657512a08b6ebaf","fen":"2k5/2bNKn2/4bpqr/N3P3/1B6/2Q5/8/5r2 b - - 0 1","line_san":"1...Nh8?? 2.Qxc7+!! Kxc7 3.Bd6+ Kc8 4.Nb6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qf7#","material_note":null,"payload":"{\"puzzle_hash\":\"77ae04ba3a7d50c4203c56def9674336ac00383c630168f09657512a08b6ebaf\",\"fen\":\"2k5/2bNKn2/4bpqr/N3P3/1B6/2Q5/8/5r2 b - - 0 1\",\"line_san\":\"1...Nh8?? 2.Qxc7+!! Kxc7 3.Bd6+ Kc8 4.Nb6#\",\"generator_seed\":3007078708,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -1), ('K', -1, 2), ('N', -3, -2), ('N', -1, 1), ('P', -3, 2), ('Q', -5, 0), ('b', -2, 2), ('b', -1, 0), ('k', 0, 0), ('n', -1, 3), ('p', -2, 3), ('q', -2, 4), ('r', -7, 3), ('r', -2, 5))\",\"solution_key\":\"san:Nh8 Qxc7 Kxc7 Bd6 Kc8 Nb6\",\"answer_key\":\"answer:Qxc7 Kxc7 Bd6 Kc8 Nb6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qf7#\",\"threat_uci\":\"g6f7\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d7, d8 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxc7+ wins; 31 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc7 forced\"},{\"ply\":4,\"text\":\"Kc8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qf7#\",\"THREAT_UCI: g6f7\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d7, d8 in the mate net.\",\"FORCE: Only Qxc7+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxc7 forced\",\"NOTE 4: Kc8 forced\"]}","created_at":"2026-07-04 20:06:57","_table":"pcp_chess_puzzles"},{"id":164,"puzzle_hash":"fff4c135eaaf2703687e010931314792fac12ab4445913b2e637a1b68a647fd3","fen":"8/4p1b1/3RB2k/n4K1b/r2ppP2/r4N2/3n1q2/7Q b - - 0 1","line_san":"1...Nac4?? 2.Qxh5+!! Kxh5 3.Bf7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Ne3#","material_note":"added ra3, pe7, pd4, qf2; material -3 -> 13; eval -483 -> +920 cp","payload":"{\"puzzle_hash\":\"fff4c135eaaf2703687e010931314792fac12ab4445913b2e637a1b68a647fd3\",\"fen\":\"8/4p1b1/3RB2k/n4K1b/r2ppP2/r4N2/3n1q2/7Q b - - 0 1\",\"line_san\":\"1...Nac4?? 2.Qxh5+!! Kxh5 3.Bf7#\",\"generator_seed\":1413890564,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('N', -2, -3), ('P', -2, -2), ('Q', 0, -5), ('R', -4, 0), ('b', -1, 1), ('b', 0, -1), ('k', 0, 0), ('n', -7, -1), ('n', -4, -4), ('p', -4, -2), ('p', -3, -2), ('p', -3, 1), ('q', -2, -4), ('r', -7, -3), ('r', -7, -2))\",\"solution_key\":\"san:Nac4 Qxh5 Kxh5 Bf7\",\"answer_key\":\"answer:Qxh5 Kxh5 Bf7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Ne3#\",\"threat_uci\":\"c4e3\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g5, g6 in the mate net.\",\"material_note\":\"added ra3, pe7, pd4, qf2; material -3 -> 13; eval -483 -> +920 cp\",\"force_notes\":[\"Only Qxh5+ wins; 26 quiet moves allow mate in 1.\",\"6 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxh5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ne3#\",\"THREAT_UCI: c4e3\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g5, g6 in the mate net.\",\"MATERIAL: added ra3, pe7, pd4, qf2; material -3 -> 13; eval -483 -> +920 cp\",\"FORCE: Only Qxh5+ wins; 26 quiet moves allow mate in 1.\",\"FORCE: 6 checking tries do not solve the puzzle.\",\"NOTE 2: Kxh5 forced\"]}","created_at":"2026-07-04 18:30:15","_table":"pcp_chess_puzzles"},{"id":163,"puzzle_hash":"e1d7251a04f46994d44a4afb3592d02ee2e51dbc42e5dcc838fd288ea4eb1c75","fen":"6BR/Q2pk3/1B3b2/2Kp1P2/2nr4/n2q4/8/8 b - - 0 1","line_san":"1...Nd2?? 2.Qxd7+!! Kxd7 3.Be6+ Ke7 4.Bd8#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Ne4#","material_note":null,"payload":"{\"puzzle_hash\":\"e1d7251a04f46994d44a4afb3592d02ee2e51dbc42e5dcc838fd288ea4eb1c75\",\"fen\":\"6BR/Q2pk3/1B3b2/2Kp1P2/2nr4/n2q4/8/8 b - - 0 1\",\"line_san\":\"1...Nd2?? 2.Qxd7+!! Kxd7 3.Be6+ Ke7 4.Bd8#\",\"generator_seed\":1571780038,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -1), ('B', 2, 1), ('K', -2, -2), ('P', 1, -2), ('Q', -4, 0), ('R', 3, 1), ('b', 1, -1), ('k', 0, 0), ('n', -4, -4), ('n', -2, -3), ('p', -1, -2), ('p', -1, 0), ('q', -1, -4), ('r', -1, -3))\",\"solution_key\":\"san:Nd2 Qxd7 Kxd7 Be6 Ke7 Bd8\",\"answer_key\":\"answer:Qxd7 Kxd7 Be6 Ke7 Bd8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Ne4#\",\"threat_uci\":\"d2e4\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d6 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxd7+ wins; 20 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Kf8, Qf7#\"},{\"ply\":4,\"text\":\"Ke7 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ne4#\",\"THREAT_UCI: d2e4\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d6 in the mate net.\",\"FORCE: Only Qxd7+ wins; 20 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: If Kf8, Qf7#\",\"NOTE 4: Ke7 forced\"]}","created_at":"2026-07-04 18:27:16","_table":"pcp_chess_puzzles"},{"id":162,"puzzle_hash":"8084a9a1417288c2b5ded56c9c6847ddd93f366b50aaf8743ab4a43517f7cdbe","fen":"8/8/1b4p1/5kB1/1r2pP1Q/1Bp1p2R/4K1p1/4n1r1 b - - 0 1","line_san":"1...Nd3?? 2.Qg4+!! Kxg4 3.Be6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Nc1#","material_note":"added rb4, pc3; material -6 -> 0; eval -364 -> +99992 cp","payload":"{\"puzzle_hash\":\"8084a9a1417288c2b5ded56c9c6847ddd93f366b50aaf8743ab4a43517f7cdbe\",\"fen\":\"8/8/1b4p1/5kB1/1r2pP1Q/1Bp1p2R/4K1p1/4n1r1 b - - 0 1\",\"line_san\":\"1...Nd3?? 2.Qg4+!! Kxg4 3.Be6#\",\"generator_seed\":1966489443,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', 1, 0), ('K', -1, -3), ('P', 0, -1), ('Q', 2, -1), ('R', 2, -2), ('b', -4, 1), ('k', 0, 0), ('n', -1, -4), ('p', -3, -2), ('p', -1, -2), ('p', -1, -1), ('p', 1, -3), ('p', 1, 1), ('r', -4, -1), ('r', 1, -4))\",\"solution_key\":\"san:Nd3 Qg4 Kxg4 Be6\",\"answer_key\":\"answer:Qg4 Kxg4 Be6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Nc1#\",\"threat_uci\":\"d3c1\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added rb4, pc3; material -6 -> 0; eval -364 -> +99992 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Nc1#\",\"THREAT_UCI: d3c1\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added rb4, pc3; material -6 -> 0; eval -364 -> +99992 cp\",\"NOTE 2: Kxg4 forced\"]}","created_at":"2026-07-04 04:06:37","_table":"pcp_chess_puzzles"},{"id":161,"puzzle_hash":"77713fbc4e10656880b8d45694f7b3b9a97805a54109337b3d848934ad4cf7ba","fen":"2n5/p1p3B1/3PKp1Q/4n2P/5rk1/3B3R/8/6q1 b - - 0 1","line_san":"1...Qb6?? 2.Qxf4+!! Kxf4 3.Bh6+ Kg4 4.Bf5#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxd6#","material_note":"added pc7, pa7; material -1 -> 1; eval +13 -> +219 cp","payload":"{\"puzzle_hash\":\"77713fbc4e10656880b8d45694f7b3b9a97805a54109337b3d848934ad4cf7ba\",\"fen\":\"2n5/p1p3B1/3PKp1Q/4n2P/5rk1/3B3R/8/6q1 b - - 0 1\",\"line_san\":\"1...Qb6?? 2.Qxf4+!! Kxf4 3.Bh6+ Kg4 4.Bf5#\",\"generator_seed\":2505333627,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -1), ('B', 0, 3), ('K', -2, 2), ('P', -3, 2), ('P', 1, 1), ('Q', 1, 2), ('R', 1, -1), ('k', 0, 0), ('n', -4, 4), ('n', -2, 1), ('p', -6, 3), ('p', -4, 3), ('p', -1, 2), ('q', 0, -3), ('r', -1, 0))\",\"solution_key\":\"san:Qb6 Qxf4 Kxf4 Bh6 Kg4 Bf5\",\"answer_key\":\"answer:Qxf4 Kxf4 Bh6 Kg4 Bf5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxd6#\",\"threat_uci\":\"b6d6\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers f5 in the mate net.\",\"material_note\":\"added pc7, pa7; material -1 -> 1; eval +13 -> +219 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"If Kxh3, Bf1#\"},{\"ply\":4,\"text\":\"Kg4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxd6#\",\"THREAT_UCI: b6d6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers f5 in the mate net.\",\"MATERIAL: added pc7, pa7; material -1 -> 1; eval +13 -> +219 cp\",\"NOTE 2: If Kxh3, Bf1#\",\"NOTE 4: Kg4 forced\"]}","created_at":"2026-07-04 03:16:09","_table":"pcp_chess_puzzles"},{"id":160,"puzzle_hash":"777b730f84dfe9d967b47fb1eaa7296916063e21bd32121dbea19259bbcdbce4","fen":"1Q1B4/6N1/1R6/r1b1r3/1pK1k3/4Pp2/4nq2/8 b - - 0 1","line_san":"1...Qe1?? 2.Qxe5+!! Kxe5 3.Re6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qc3#","material_note":null,"payload":"{\"puzzle_hash\":\"777b730f84dfe9d967b47fb1eaa7296916063e21bd32121dbea19259bbcdbce4\",\"fen\":\"1Q1B4/6N1/1R6/r1b1r3/1pK1k3/4Pp2/4nq2/8 b - - 0 1\",\"line_san\":\"1...Qe1?? 2.Qxe5+!! Kxe5 3.Re6#\",\"generator_seed\":874231760,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -1), ('K', 0, -2), ('N', -3, 2), ('P', 1, 0), ('Q', -4, -3), ('R', -2, -3), ('b', -1, -2), ('k', 0, 0), ('n', 2, 0), ('p', 0, -3), ('p', 1, 1), ('q', 2, 1), ('r', -1, -4), ('r', -1, 0))\",\"solution_key\":\"san:Qe1 Qxe5 Kxe5 Re6\",\"answer_key\":\"answer:Qxe5 Kxe5 Re6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qc3#\",\"threat_uci\":\"e1c3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d3, d4, d5 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxe5+ wins; 24 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc3#\",\"THREAT_UCI: e1c3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d3, d4, d5 in the mate net.\",\"FORCE: Only Qxe5+ wins; 24 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe5 forced\"]}","created_at":"2026-07-03 21:16:28","_table":"pcp_chess_puzzles"},{"id":159,"puzzle_hash":"5823454bfd7359b6e1014f8299aed4279e1975e539121a1d4c293b4fc1f98176","fen":"8/8/7R/6Q1/3p1b2/3B4/1qnPKPb1/6k1 b - - 0 1","line_san":"1...Qc1?? 2.Qxg2+!! Kxg2 3.Be4+ Kg1 4.Rh1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxd2#","material_note":null,"payload":"{\"puzzle_hash\":\"5823454bfd7359b6e1014f8299aed4279e1975e539121a1d4c293b4fc1f98176\",\"fen\":\"8/8/7R/6Q1/3p1b2/3B4/1qnPKPb1/6k1 b - - 0 1\",\"line_san\":\"1...Qc1?? 2.Qxg2+!! Kxg2 3.Be4+ Kg1 4.Rh1#\",\"generator_seed\":2024634034,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, -1), ('P', -3, -1), ('P', -1, -1), ('Q', 0, -4), ('R', 1, -5), ('b', -1, -3), ('b', 0, -1), ('k', 0, 0), ('n', -4, -1), ('p', -3, -3), ('q', -5, -1))\",\"solution_key\":\"san:Qc1 Qxg2 Kxg2 Be4 Kg1 Rh1\",\"answer_key\":\"answer:Qxg2 Kxg2 Be4 Kg1 Rh1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxd2#\",\"threat_uci\":\"c1d2\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers f1, f2 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxg2+ wins; 39 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg2 forced\"},{\"ply\":4,\"text\":\"Kg1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxd2#\",\"THREAT_UCI: c1d2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers f1, f2 in the mate net.\",\"FORCE: Only Qxg2+ wins; 39 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxg2 forced\",\"NOTE 4: Kg1 forced\"]}","created_at":"2026-07-03 21:10:58","_table":"pcp_chess_puzzles"},{"id":158,"puzzle_hash":"a06d151208c405e8feab5488fc2ab1afc01dea895802f9cbe9505432705bc3a9","fen":"2bQ4/pkP1Bp2/1p1K2n1/2p1P3/8/3B1n2/7R/2q5 b - - 0 1","line_san":"1...Qf4?? 2.Qxc8+!! Kxc8 3.Ba6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxe5#","material_note":"added nf3, pf7; material -4 -> 0; eval +338 -> +756 cp","payload":"{\"puzzle_hash\":\"a06d151208c405e8feab5488fc2ab1afc01dea895802f9cbe9505432705bc3a9\",\"fen\":\"2bQ4/pkP1Bp2/1p1K2n1/2p1P3/8/3B1n2/7R/2q5 b - - 0 1\",\"line_san\":\"1...Qf4?? 2.Qxc8+!! Kxc8 3.Ba6#\",\"generator_seed\":603474444,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', 0, -3), ('K', -1, -2), ('P', -2, -3), ('P', 0, -1), ('Q', 1, -2), ('R', -5, -6), ('b', 1, -1), ('k', 0, 0), ('n', -4, -4), ('n', -1, -5), ('p', -2, -1), ('p', -1, 0), ('p', 0, -4), ('p', 0, 1), ('q', -6, -1))\",\"solution_key\":\"san:Qf4 Qxc8 Kxc8 Ba6\",\"answer_key\":\"answer:Qxc8 Kxc8 Ba6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxe5#\",\"threat_uci\":\"f4e5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers c6, c7 in the mate net.\",\"material_note\":\"added nf3, pf7; material -4 -> 0; eval +338 -> +756 cp\",\"force_notes\":[\"Only Qxc8+ wins; 32 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxe5#\",\"THREAT_UCI: f4e5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers c6, c7 in the mate net.\",\"MATERIAL: added nf3, pf7; material -4 -> 0; eval +338 -> +756 cp\",\"FORCE: Only Qxc8+ wins; 32 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: Kxc8 forced\"]}","created_at":"2026-07-03 19:05:41","_table":"pcp_chess_puzzles"},{"id":157,"puzzle_hash":"e46b8f29c1d29f297b817775cebb3c7655ebd9202e079309ca0d6ff8b1234c6b","fen":"8/5p2/2k1B3/PbN5/3Kppn1/8/1Qp2nq1/R7 b - - 0 1","line_san":"1...Qh3?? 2.Qxb5+!! Kxb5 3.Bd7+ Kb4 4.Ra4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qe3#","material_note":"added pf4, pf7; material -1 -> 1; eval -25 -> +295 cp","payload":"{\"puzzle_hash\":\"e46b8f29c1d29f297b817775cebb3c7655ebd9202e079309ca0d6ff8b1234c6b\",\"fen\":\"8/5p2/2k1B3/PbN5/3Kppn1/8/1Qp2nq1/R7 b - - 0 1\",\"line_san\":\"1...Qh3?? 2.Qxb5+!! Kxb5 3.Bd7+ Kb4 4.Ra4#\",\"generator_seed\":3141872993,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -2, 0), ('K', -1, -2), ('N', 0, -1), ('P', 2, -1), ('Q', 1, -4), ('R', 2, -5), ('b', 1, -1), ('k', 0, 0), ('n', -4, -2), ('n', -3, -4), ('p', -3, -2), ('p', -3, 1), ('p', -2, -2), ('p', 0, -4), ('q', -4, -4))\",\"solution_key\":\"san:Qh3 Qxb5 Kxb5 Bd7 Kb4 Ra4\",\"answer_key\":\"answer:Qxb5 Kxb5 Bd7 Kb4 Ra4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qe3#\",\"threat_uci\":\"h3e3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c5, d5 in the mate net.\",\"material_note\":\"added pf4, pf7; material -1 -> 1; eval -25 -> +295 cp\",\"force_notes\":[\"Only Qxb5+ wins; 33 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Kc7, Qb6#\"},{\"ply\":4,\"text\":\"Kb4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe3#\",\"THREAT_UCI: h3e3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c5, d5 in the mate net.\",\"MATERIAL: added pf4, pf7; material -1 -> 1; eval -25 -> +295 cp\",\"FORCE: Only Qxb5+ wins; 33 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: If Kc7, Qb6#\",\"NOTE 4: Kb4 forced\"]}","created_at":"2026-07-03 19:04:12","_table":"pcp_chess_puzzles"},{"id":156,"puzzle_hash":"5741f8f32d165e5c6fde088cc0764911cdb06cb63ab62b13ee8962e3a9b3d514","fen":"B7/8/2n5/Q7/2prq3/bPKn4/k2B2R1/1b6 b - - 0 1","line_san":"1...Nde5?? 2.Qxa3+!! Kxa3 3.Bc1#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qc2#","material_note":null,"payload":"{\"puzzle_hash\":\"5741f8f32d165e5c6fde088cc0764911cdb06cb63ab62b13ee8962e3a9b3d514\",\"fen\":\"B7/8/2n5/Q7/2prq3/bPKn4/k2B2R1/1b6 b - - 0 1\",\"line_san\":\"1...Nde5?? 2.Qxa3+!! Kxa3 3.Bc1#\",\"generator_seed\":940473928,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, 0), ('B', 0, -3), ('K', -1, -2), ('P', -1, -1), ('Q', -3, 0), ('R', 0, -6), ('b', -1, 0), ('b', 1, -1), ('k', 0, 0), ('n', -4, -2), ('n', -1, -3), ('p', -2, -2), ('q', -2, -4), ('r', -2, -3))\",\"solution_key\":\"san:Nde5 Qxa3 Kxa3 Bc1\",\"answer_key\":\"answer:Qxa3 Kxa3 Bc1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qc2#\",\"threat_uci\":\"e4c2\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers b2, b3 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxa3+ wins; 25 quiet moves allow mate in 1.\",\"6 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxa3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc2#\",\"THREAT_UCI: e4c2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers b2, b3 in the mate net.\",\"FORCE: Only Qxa3+ wins; 25 quiet moves allow mate in 1.\",\"FORCE: 6 checking tries do not solve the puzzle.\",\"NOTE 2: Kxa3 forced\"]}","created_at":"2026-07-03 13:33:14","_table":"pcp_chess_puzzles"},{"id":155,"puzzle_hash":"2c266457a6fefbe2c83cc0cc1f529494f1c2258cb1be9f02ece33e41f9bca9bb","fen":"3Q4/2R5/8/8/5p2/5brq/3nPKn1/2Nk2B1 b - - 0 1","line_san":"1...Ne1?? 2.Qxd2+!! Kxd2 3.Nb3+ Kd1 4.Rc1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qg2#","material_note":null,"payload":"{\"puzzle_hash\":\"2c266457a6fefbe2c83cc0cc1f529494f1c2258cb1be9f02ece33e41f9bca9bb\",\"fen\":\"3Q4/2R5/8/8/5p2/5brq/3nPKn1/2Nk2B1 b - - 0 1\",\"line_san\":\"1...Ne1?? 2.Qxd2+!! Kxd2 3.Nb3+ Kd1 4.Rc1#\",\"generator_seed\":4072063077,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('N', 1, 0), ('P', -1, -1), ('Q', 0, -7), ('R', 1, -6), ('b', -2, -2), ('k', 0, 0), ('n', -3, -1), ('n', 0, -1), ('p', -2, -3), ('q', -4, -2), ('r', -3, -2))\",\"solution_key\":\"san:Ne1 Qxd2 Kxd2 Nb3 Kd1 Rc1\",\"answer_key\":\"answer:Qxd2 Kxd2 Nb3 Kd1 Rc1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qg2#\",\"threat_uci\":\"h3g2\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e1, e2 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxd2+ stops mate in 1; 36 other moves lose immediately.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd2 forced\"},{\"ply\":4,\"text\":\"Kd1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg2#\",\"THREAT_UCI: h3g2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e1, e2 in the mate net.\",\"FORCE: Only Qxd2+ stops mate in 1; 36 other moves lose immediately.\",\"NOTE 2: Kxd2 forced\",\"NOTE 4: Kd1 forced\"]}","created_at":"2026-07-03 13:32:30","_table":"pcp_chess_puzzles"},{"id":154,"puzzle_hash":"94447edc717d88b04fa638273914b7c993389730237e4cc51631543891007061","fen":"6r1/3Q4/4PnPp/B4K2/3b1NP1/n2Pkp2/5q2/2R5 b - - 0 1","line_san":"1...Qg3?? 2.Qxd4+!! Kxd4 3.Bb6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxg4#","material_note":"added na3, ph6; material -3 -> 1; eval +0 -> +128 cp","payload":"{\"puzzle_hash\":\"94447edc717d88b04fa638273914b7c993389730237e4cc51631543891007061\",\"fen\":\"6r1/3Q4/4PnPp/B4K2/3b1NP1/n2Pkp2/5q2/2R5 b - - 0 1\",\"line_san\":\"1...Qg3?? 2.Qxd4+!! Kxd4 3.Bb6#\",\"generator_seed\":1111989675,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('K', 1, -2), ('N', 1, -1), ('P', -1, 0), ('P', 0, -3), ('P', 2, -3), ('P', 2, -1), ('Q', -1, -4), ('R', -2, 2), ('b', -1, -1), ('k', 0, 0), ('n', -4, 0), ('n', 1, -3), ('p', 1, 0), ('p', 3, -3), ('q', 1, 1), ('r', 2, -5))\",\"solution_key\":\"san:Qg3 Qxd4 Kxd4 Bb6\",\"answer_key\":\"answer:Qxd4 Kxd4 Bb6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxg4#\",\"threat_uci\":\"g3g4\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers e4, f4 in the mate net.\",\"material_note\":\"added na3, ph6; material -3 -> 1; eval +0 -> +128 cp\",\"force_notes\":[\"Only Qxd4+ wins; 40 quiet moves allow mate in 1.\",\"4 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxg4#\",\"THREAT_UCI: g3g4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers e4, f4 in the mate net.\",\"MATERIAL: added na3, ph6; material -3 -> 1; eval +0 -> +128 cp\",\"FORCE: Only Qxd4+ wins; 40 quiet moves allow mate in 1.\",\"FORCE: 4 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd4 forced\"]}","created_at":"2026-07-03 02:04:33","_table":"pcp_chess_puzzles"},{"id":153,"puzzle_hash":"a2fec7481b7d0752a463749055b60c84e5ce98ade8d34af6728dbb60cc232835","fen":"8/2pP3Q/p3B3/1nKPR3/3P4/2kr1n2/6q1/1rB5 b - - 0 1","line_san":"1...Na7?? 2.Qxd3+!! Kxd3 3.Bf5+ Kc3 4.Re3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rb5#","material_note":"added nf3, qg2; material -8 -> 4; eval -513 -> +673 cp","payload":"{\"puzzle_hash\":\"a2fec7481b7d0752a463749055b60c84e5ce98ade8d34af6728dbb60cc232835\",\"fen\":\"8/2pP3Q/p3B3/1nKPR3/3P4/2kr1n2/6q1/1rB5 b - - 0 1\",\"line_san\":\"1...Na7?? 2.Qxd3+!! Kxd3 3.Bf5+ Kc3 4.Re3#\",\"generator_seed\":183944803,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('B', 2, 0), ('K', -2, 0), ('P', -4, -1), ('P', -2, -1), ('P', -1, -1), ('Q', -4, -5), ('R', -2, -2), ('k', 0, 0), ('n', -2, 1), ('n', 0, -3), ('p', -4, 0), ('p', -3, 2), ('q', 1, -4), ('r', 0, -1), ('r', 2, 1))\",\"solution_key\":\"san:Na7 Qxd3 Kxd3 Bf5 Kc3 Re3\",\"answer_key\":\"answer:Qxd3 Kxd3 Bf5 Kc3 Re3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rb5#\",\"threat_uci\":\"b1b5\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers b4, c4, d4 in the mate net.\",\"material_note\":\"added nf3, qg2; material -8 -> 4; eval -513 -> +673 cp\",\"force_notes\":[\"Only Qxd3+ wins; 36 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd3 forced\"},{\"ply\":4,\"text\":\"Kc3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rb5#\",\"THREAT_UCI: b1b5\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers b4, c4, d4 in the mate net.\",\"MATERIAL: added nf3, qg2; material -8 -> 4; eval -513 -> +673 cp\",\"FORCE: Only Qxd3+ wins; 36 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd3 forced\",\"NOTE 4: Kc3 forced\"]}","created_at":"2026-07-03 01:26:50","_table":"pcp_chess_puzzles"},{"id":152,"puzzle_hash":"69cd22340c66978e0999cf778065283c79e81723dcb11c781777768e48e1faf4","fen":"8/8/3p4/R1QPkp1r/3r1n1p/4pK1p/4B3/2B4n b - - 0 1","line_san":"1...Rg5?? 2.Qxd4+!! Kxd4 3.Bb2#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rg3#","material_note":"added ph4; material -1 -> 0; eval +519 -> +523 cp","payload":"{\"puzzle_hash\":\"69cd22340c66978e0999cf778065283c79e81723dcb11c781777768e48e1faf4\",\"fen\":\"8/8/3p4/R1QPkp1r/3r1n1p/4pK1p/4B3/2B4n b - - 0 1\",\"line_san\":\"1...Rg5?? 2.Qxd4+!! Kxd4 3.Bb2#\",\"generator_seed\":869425189,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', -3, 0), ('K', -2, 1), ('P', 0, -1), ('Q', 0, -2), ('R', 0, -4), ('k', 0, 0), ('n', -4, 3), ('n', -1, 1), ('p', -2, 0), ('p', -2, 3), ('p', -1, 3), ('p', 0, 1), ('p', 1, -1), ('r', -1, -1), ('r', 0, 3))\",\"solution_key\":\"san:Rg5 Qxd4 Kxd4 Bb2\",\"answer_key\":\"answer:Qxd4 Kxd4 Bb2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rg3#\",\"threat_uci\":\"g5g3\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e4, f4 in the mate net.\",\"material_note\":\"added ph4; material -1 -> 0; eval +519 -> +523 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rg3#\",\"THREAT_UCI: g5g3\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e4, f4 in the mate net.\",\"MATERIAL: added ph4; material -1 -> 0; eval +519 -> +523 cp\",\"NOTE 2: Kxd4 forced\"]}","created_at":"2026-07-02 23:32:13","_table":"pcp_chess_puzzles"},{"id":151,"puzzle_hash":"fbbea217bb070a2c5ed7f7787c2ed70825c689549b3152daf901ca89b4d16fda","fen":"8/3B1k2/r3nNbP/3nK3/3rp3/5pQR/8/8 b - - 0 1","line_san":"1...Ne3?? 2.Qxg6+!! Kxg6 3.Be8+ Kg5 4.Rh5#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Nc4#","material_note":"added ra6; material -5 -> 0; eval -496 -> +155 cp","payload":"{\"puzzle_hash\":\"fbbea217bb070a2c5ed7f7787c2ed70825c689549b3152daf901ca89b4d16fda\",\"fen\":\"8/3B1k2/r3nNbP/3nK3/3rp3/5pQR/8/8 b - - 0 1\",\"line_san\":\"1...Ne3?? 2.Qxg6+!! Kxg6 3.Be8+ Kg5 4.Rh5#\",\"generator_seed\":1357716836,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -2, 0), ('K', -1, -2), ('N', 0, -1), ('P', 2, -1), ('Q', 1, -4), ('R', 2, -4), ('b', 1, -1), ('k', 0, 0), ('n', -2, -2), ('n', -1, -1), ('p', -1, -3), ('p', 0, -4), ('r', -5, -1), ('r', -2, -3))\",\"solution_key\":\"san:Ne3 Qxg6 Kxg6 Be8 Kg5 Rh5\",\"answer_key\":\"answer:Qxg6 Kxg6 Be8 Kg5 Rh5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Nc4#\",\"threat_uci\":\"e3c4\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e6, f6 in the mate net.\",\"material_note\":\"added ra6; material -5 -> 0; eval -496 -> +155 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"If Ke7, Qe8#\"},{\"ply\":4,\"text\":\"Kg5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Nc4#\",\"THREAT_UCI: e3c4\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e6, f6 in the mate net.\",\"MATERIAL: added ra6; material -5 -> 0; eval -496 -> +155 cp\",\"NOTE 2: If Ke7, Qe8#\",\"NOTE 4: Kg5 forced\"]}","created_at":"2026-07-02 23:28:52","_table":"pcp_chess_puzzles"},{"id":150,"puzzle_hash":"c00aabe253bcc8992dcf7e6fd092f9623f5fe2a72333c21a6013e01557f71666","fen":"5B1b/7B/2P1bQ2/3k4/3pnKN1/6P1/2qn4/8 b - - 0 1","line_san":"1...Qd3?? 2.Qxe6+!! Kxe6 3.Bg8#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxg3#","material_note":"added bh8; material -1 -> 2; eval -334 -> +497 cp","payload":"{\"puzzle_hash\":\"c00aabe253bcc8992dcf7e6fd092f9623f5fe2a72333c21a6013e01557f71666\",\"fen\":\"5B1b/7B/2P1bQ2/3k4/3pnKN1/6P1/2qn4/8 b - - 0 1\",\"line_san\":\"1...Qd3?? 2.Qxe6+!! Kxe6 3.Bg8#\",\"generator_seed\":252218755,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', -2, -3), ('K', -2, 1), ('N', -3, 1), ('P', -3, 2), ('P', 1, -1), ('Q', -2, -1), ('b', -4, -3), ('b', -1, -1), ('k', 0, 0), ('n', -1, 1), ('n', 0, 3), ('p', 0, 1), ('q', 1, 3))\",\"solution_key\":\"san:Qd3 Qxe6 Kxe6 Bg8\",\"answer_key\":\"answer:Qxe6 Kxe6 Bg8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxg3#\",\"threat_uci\":\"d3g3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers e4, e5 in the mate net.\",\"material_note\":\"added bh8; material -1 -> 2; eval -334 -> +497 cp\",\"force_notes\":[\"Only Qxe6+ wins; 22 quiet moves allow mate in 1.\",\"7 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxg3#\",\"THREAT_UCI: d3g3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers e4, e5 in the mate net.\",\"MATERIAL: added bh8; material -1 -> 2; eval -334 -> +497 cp\",\"FORCE: Only Qxe6+ wins; 22 quiet moves allow mate in 1.\",\"FORCE: 7 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe6 forced\"]}","created_at":"2026-07-02 22:53:55","_table":"pcp_chess_puzzles"},{"id":149,"puzzle_hash":"9e7b52fdd151a3c5b82db6c635f0f2f89eddcd1f8bc3f8b7e15ef01abd00533a","fen":"8/8/8/q2p2R1/2rn1p1Q/2bK1P2/4Br2/4k1N1 b - - 0 1","line_san":"1...Bd2?? 2.Qxf2+!! Kxf2 3.Nh3+ Ke1 4.Rg1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qa3#","material_note":null,"payload":"{\"puzzle_hash\":\"9e7b52fdd151a3c5b82db6c635f0f2f89eddcd1f8bc3f8b7e15ef01abd00533a\",\"fen\":\"8/8/8/q2p2R1/2rn1p1Q/2bK1P2/4Br2/4k1N1 b - - 0 1\",\"line_san\":\"1...Bd2?? 2.Qxf2+!! Kxf2 3.Nh3+ Ke1 4.Rg1#\",\"generator_seed\":3994747301,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -1, 0), ('K', -2, -1), ('N', 0, 2), ('P', -2, 1), ('Q', -3, 3), ('R', -4, 2), ('b', -2, -2), ('k', 0, 0), ('n', -3, -1), ('p', -4, -1), ('p', -3, 1), ('q', -4, -4), ('r', -3, -2), ('r', -1, 1))\",\"solution_key\":\"san:Bd2 Qxf2 Kxf2 Nh3 Ke1 Rg1\",\"answer_key\":\"answer:Qxf2 Kxf2 Nh3 Ke1 Rg1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qa3#\",\"threat_uci\":\"a5a3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, e2 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf2 forced\"},{\"ply\":4,\"text\":\"Ke1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qa3#\",\"THREAT_UCI: a5a3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, e2 in the mate net.\",\"NOTE 2: Kxf2 forced\",\"NOTE 4: Ke1 forced\"]}","created_at":"2026-07-02 22:51:42","_table":"pcp_chess_puzzles"},{"id":148,"puzzle_hash":"473fb42d6a862769daf929b1d334380dd06c643d253adf755b3bca0a477c0f14","fen":"8/6r1/q2p4/p2k4/2pPb1N1/1PK5/rP1B4/4QR2 b - - 0 1","line_san":"1...Qb6?? 2.Qxe4+!! Kxe4 3.Nf6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxb3#","material_note":"added ra2, rg7; material -8 -> 2; eval -570 -> +353 cp","payload":"{\"puzzle_hash\":\"473fb42d6a862769daf929b1d334380dd06c643d253adf755b3bca0a477c0f14\",\"fen\":\"8/6r1/q2p4/p2k4/2pPb1N1/1PK5/rP1B4/4QR2 b - - 0 1\",\"line_san\":\"1...Qb6?? 2.Qxe4+!! Kxe4 3.Nf6#\",\"generator_seed\":296487364,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('N', -1, 3), ('P', -3, -2), ('P', -2, -2), ('P', -1, 0), ('Q', -4, 1), ('R', -4, 2), ('b', -1, 1), ('k', 0, 0), ('p', -1, -1), ('p', 0, -3), ('p', 1, 0), ('q', 1, -3), ('r', -3, -3), ('r', 2, 3))\",\"solution_key\":\"san:Qb6 Qxe4 Kxe4 Nf6\",\"answer_key\":\"answer:Qxe4 Kxe4 Nf6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxb3#\",\"threat_uci\":\"b6b3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers c4, d4 in the mate net.\",\"material_note\":\"added ra2, rg7; material -8 -> 2; eval -570 -> +353 cp\",\"force_notes\":[\"Only Qxe4+ wins; 27 quiet moves allow mate in 1.\",\"4 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxb3#\",\"THREAT_UCI: b6b3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers c4, d4 in the mate net.\",\"MATERIAL: added ra2, rg7; material -8 -> 2; eval -570 -> +353 cp\",\"FORCE: Only Qxe4+ wins; 27 quiet moves allow mate in 1.\",\"FORCE: 4 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe4 forced\"]}","created_at":"2026-07-02 22:45:38","_table":"pcp_chess_puzzles"},{"id":147,"puzzle_hash":"3b78759a67f4c42bd9e50d25aa1ad18ca4c2526490c6b06f7e16032551e1596c","fen":"3q3b/3n4/1n6/1K1N4/1P6/kb4Q1/N4R2/8 b - - 0 1","line_san":"1...Qa8?? 2.Qxb3+!! Kxb3 3.Nc1+ Ka3 4.Ra2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qa4#","material_note":"added bh8; material -3 -> 0; eval +538 -> +932 cp","payload":"{\"puzzle_hash\":\"3b78759a67f4c42bd9e50d25aa1ad18ca4c2526490c6b06f7e16032551e1596c\",\"fen\":\"3q3b/3n4/1n6/1K1N4/1P6/kb4Q1/N4R2/8 b - - 0 1\",\"line_san\":\"1...Qa8?? 2.Qxb3+!! Kxb3 3.Nc1+ Ka3 4.Ra2#\",\"generator_seed\":88947753,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('K', -2, -1), ('N', -2, -3), ('N', 1, 0), ('P', -1, -1), ('Q', 0, -6), ('R', 1, -5), ('b', -5, -7), ('b', 0, -1), ('k', 0, 0), ('n', -4, -3), ('n', -3, -1), ('q', -5, -3))\",\"solution_key\":\"san:Qa8 Qxb3 Kxb3 Nc1 Ka3 Ra2\",\"answer_key\":\"answer:Qxb3 Kxb3 Nc1 Ka3 Ra2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qa4#\",\"threat_uci\":\"a8a4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers a4, b4 in the mate net.\",\"material_note\":\"added bh8; material -3 -> 0; eval +538 -> +932 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb3 forced\"},{\"ply\":4,\"text\":\"Ka3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qa4#\",\"THREAT_UCI: a8a4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers a4, b4 in the mate net.\",\"MATERIAL: added bh8; material -3 -> 0; eval +538 -> +932 cp\",\"NOTE 2: Kxb3 forced\",\"NOTE 4: Ka3 forced\"]}","created_at":"2026-07-02 22:38:24","_table":"pcp_chess_puzzles"},{"id":146,"puzzle_hash":"4174ad808bfadd0784e9fa9440ccc5b3b966bd96ee9bb9007bae77e1aa8a1d50","fen":"8/Q3P3/4KN2/1p2n1r1/3r2n1/B3k3/2R1P2q/8 b - - 0 1","line_san":"1...Qh6?? 2.Qxd4+!! Kxd4 3.Bc5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxf6#","material_note":"added rg5, pb5; material -2 -> 4; eval -600 -> +156 cp","payload":"{\"puzzle_hash\":\"4174ad808bfadd0784e9fa9440ccc5b3b966bd96ee9bb9007bae77e1aa8a1d50\",\"fen\":\"8/Q3P3/4KN2/1p2n1r1/3r2n1/B3k3/2R1P2q/8 b - - 0 1\",\"line_san\":\"1...Qh6?? 2.Qxd4+!! Kxd4 3.Bc5#\",\"generator_seed\":194197460,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('K', 0, -3), ('N', 1, -3), ('P', 0, -4), ('P', 0, 1), ('Q', -4, -4), ('R', -2, 1), ('k', 0, 0), ('n', 0, -2), ('n', 2, -1), ('p', -3, -2), ('q', 3, 1), ('r', -1, -1), ('r', 2, -2))\",\"solution_key\":\"san:Qh6 Qxd4 Kxd4 Bc5\",\"answer_key\":\"answer:Qxd4 Kxd4 Bc5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxf6#\",\"threat_uci\":\"h6f6\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":null,\"material_note\":\"added rg5, pb5; material -2 -> 4; eval -600 -> +156 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxf6#\",\"THREAT_UCI: h6f6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"MATERIAL: added rg5, pb5; material -2 -> 4; eval -600 -> +156 cp\",\"NOTE 2: Kxd4 forced\"]}","created_at":"2026-07-02 21:34:04","_table":"pcp_chess_puzzles"},{"id":145,"puzzle_hash":"f0a62789ef1b52c3e0fe711b33491210fa387b52005b427e5e75da03e7703a69","fen":"3QB2r/1n6/8/1P2R3/1KP5/3b1p2/1pkp4/1rb2N2 b - - 0 1","line_san":"1...Ra1?? 2.Qxd3+!! Kxd3 3.Bg6+ Kd4 4.Rd5#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens b1=R#","material_note":"added rh8, pf3; material -6 -> 0; eval +692 -> +1129 cp","payload":"{\"puzzle_hash\":\"f0a62789ef1b52c3e0fe711b33491210fa387b52005b427e5e75da03e7703a69\",\"fen\":\"3QB2r/1n6/8/1P2R3/1KP5/3b1p2/1pkp4/1rb2N2 b - - 0 1\",\"line_san\":\"1...Ra1?? 2.Qxd3+!! Kxd3 3.Bg6+ Kd4 4.Rd5#\",\"generator_seed\":1832243922,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, -2), ('K', -2, 1), ('N', 1, -3), ('P', -3, 1), ('P', -2, 0), ('Q', -6, -1), ('R', -3, -2), ('b', -1, -1), ('b', 1, 0), ('k', 0, 0), ('n', -5, 1), ('p', -1, -3), ('p', 0, -1), ('p', 0, 1), ('r', -6, -5), ('r', 1, 1))\",\"solution_key\":\"san:Ra1 Qxd3 Kxd3 Bg6 Kd4 Rd5\",\"answer_key\":\"answer:Qxd3 Kxd3 Bg6 Kd4 Rd5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens b1=R#\",\"threat_uci\":\"b2b1r\",\"threat_piece\":\"P=R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers b3, c3 in the mate net.\",\"material_note\":\"added rh8, pf3; material -6 -> 0; eval +692 -> +1129 cp\",\"force_notes\":[\"Only Qxd3+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"Non-direct tries checked: Qd4.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Kd1, Qb3#\"},{\"ply\":4,\"text\":\"Kd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens b1=R#\",\"THREAT_UCI: b2b1r\",\"THREAT_PIECE: P=R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers b3, c3 in the mate net.\",\"MATERIAL: added rh8, pf3; material -6 -> 0; eval +692 -> +1129 cp\",\"FORCE: Only Qxd3+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Qd4.\",\"NOTE 2: If Kd1, Qb3#\",\"NOTE 4: Kd4 forced\"]}","created_at":"2026-07-02 21:25:00","_table":"pcp_chess_puzzles"},{"id":144,"puzzle_hash":"175f3d4c0c84f588422d7e9d4e2156639714ee7f47490250e567df70ee5c5955","fen":"3B3q/5p1n/5p2/3RnK2/8/1Q2b1N1/4Pkp1/4r3 b - - 0 1","line_san":"1...Qg7?? 2.Qxe3+!! Kxe3 3.Bb6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qg6#","material_note":null,"payload":"{\"puzzle_hash\":\"175f3d4c0c84f588422d7e9d4e2156639714ee7f47490250e567df70ee5c5955\",\"fen\":\"3B3q/5p1n/5p2/3RnK2/8/1Q2b1N1/4Pkp1/4r3 b - - 0 1\",\"line_san\":\"1...Qg7?? 2.Qxe3+!! Kxe3 3.Bb6#\",\"generator_seed\":3820814027,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, -2), ('K', -3, 0), ('N', -1, 1), ('P', 0, -1), ('Q', -1, -4), ('R', -3, -2), ('b', -1, -1), ('k', 0, 0), ('n', -5, 2), ('n', -3, -1), ('p', -5, 0), ('p', -4, 0), ('p', 0, 1), ('q', -6, 2), ('r', 1, -1))\",\"solution_key\":\"san:Qg7 Qxe3 Kxe3 Bb6\",\"answer_key\":\"answer:Qxe3 Kxe3 Bb6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qg6#\",\"threat_uci\":\"g7g6\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg6#\",\"THREAT_UCI: g7g6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"NOTE 2: Kxe3 forced\"]}","created_at":"2026-07-02 21:01:14","_table":"pcp_chess_puzzles"},{"id":143,"puzzle_hash":"774733947ec5203e2b2e4c8b452ce63319e72bb2bb438626b11c642b52200117","fen":"6r1/3n1p2/3p3R/5Kb1/1B3n2/4Pkr1/6pQ/5B2 b - - 0 1","line_san":"1...Nd5?? 2.Qxg3+!! Kxg3 3.Be1+ Kf3 4.Rh3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Ne7#","material_note":"added rg8; material -4 -> 1","payload":"{\"puzzle_hash\":\"774733947ec5203e2b2e4c8b452ce63319e72bb2bb438626b11c642b52200117\",\"fen\":\"6r1/3n1p2/3p3R/5Kb1/1B3n2/4Pkr1/6pQ/5B2 b - - 0 1\",\"line_san\":\"1...Nd5?? 2.Qxg3+!! Kxg3 3.Be1+ Kf3 4.Rh3#\",\"generator_seed\":4198079544,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -1), ('B', 0, 2), ('K', 0, -2), ('P', -1, 0), ('Q', 2, 1), ('R', 2, -3), ('b', 1, -2), ('k', 0, 0), ('n', -2, -4), ('n', 0, -1), ('p', -2, -3), ('p', 0, -4), ('p', 1, 1), ('r', 1, -5), ('r', 1, 0))\",\"solution_key\":\"san:Nd5 Qxg3 Kxg3 Be1 Kf3 Rh3\",\"answer_key\":\"answer:Qxg3 Kxg3 Be1 Kf3 Rh3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Ne7#\",\"threat_uci\":\"d5e7\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e4, f4, g4 in the mate net.\",\"material_note\":\"added rg8; material -4 -> 1\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg3 forced\"},{\"ply\":4,\"text\":\"Kf3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ne7#\",\"THREAT_UCI: d5e7\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e4, f4, g4 in the mate net.\",\"MATERIAL: added rg8; material -4 -> 1\",\"NOTE 2: Kxg3 forced\",\"NOTE 4: Kf3 forced\"]}","created_at":"2026-07-02 20:58:36","_table":"pcp_chess_puzzles"},{"id":142,"puzzle_hash":"0d5a854bbc9b65f7989041e64dd25be542e8a9e8d86f9a066d975241856791a1","fen":"4kbQ1/3p4/3p1KPN/6PB/8/3b1nrn/1B6/3q2r1 b - - 0 1","line_san":"1...Qd2?? 2.Qxf8+!! Kxf8 3.g7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxg5#","material_note":"added rg1, nh3, rg3, pd6; material -1 -> 13; eval -576 -> +549 cp","payload":"{\"puzzle_hash\":\"0d5a854bbc9b65f7989041e64dd25be542e8a9e8d86f9a066d975241856791a1\",\"fen\":\"4kbQ1/3p4/3p1KPN/6PB/8/3b1nrn/1B6/3q2r1 b - - 0 1\",\"line_san\":\"1...Qd2?? 2.Qxf8+!! Kxf8 3.g7#\",\"generator_seed\":1655913201,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, -3), ('B', -3, 3), ('K', -2, 1), ('N', -2, 3), ('P', -3, 2), ('P', -2, 2), ('Q', 0, 2), ('b', -5, -1), ('b', 0, 1), ('k', 0, 0), ('n', -5, 1), ('n', -5, 3), ('p', -2, -1), ('p', -1, -1), ('q', -7, -1), ('r', -7, 2), ('r', -5, 2))\",\"solution_key\":\"san:Qd2 Qxf8 Kxf8 g7\",\"answer_key\":\"answer:Qxf8 Kxf8 g7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxg5#\",\"threat_uci\":\"d2g5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers e7, f7 in the mate net.\",\"material_note\":\"added rg1, nh3, rg3, pd6; material -1 -> 13; eval -576 -> +549 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: pawn-mate\",\"THREAT: Black threatens Qxg5#\",\"THREAT_UCI: d2g5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers e7, f7 in the mate net.\",\"MATERIAL: added rg1, nh3, rg3, pd6; material -1 -> 13; eval -576 -> +549 cp\",\"NOTE 2: Kxf8 forced\"]}","created_at":"2026-07-02 20:09:29","_table":"pcp_chess_puzzles"},{"id":141,"puzzle_hash":"7a2cea8f1b4aa5e091878a986ffa55e39259aa8a5dcbf17e59d529eaedbe64cd","fen":"1R4Q1/3p1rpP/np1KNk2/8/1n1p1r2/4b3/8/8 b - - 0 1","line_san":"1...Rf5?? 2.Qxf7+!! Kxf7 3.h8=N+ Kf6 4.Rf8#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rd5#","material_note":null,"payload":"{\"puzzle_hash\":\"7a2cea8f1b4aa5e091878a986ffa55e39259aa8a5dcbf17e59d529eaedbe64cd\",\"fen\":\"1R4Q1/3p1rpP/np1KNk2/8/1n1p1r2/4b3/8/8 b - - 0 1\",\"line_san\":\"1...Rf5?? 2.Qxf7+!! Kxf7 3.h8=N+ Kf6 4.Rf8#\",\"generator_seed\":1239624639,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('K', -2, 0), ('N', -1, 0), ('P', 2, -1), ('Q', 1, -2), ('R', -4, -2), ('b', -1, 3), ('k', 0, 0), ('n', -5, 0), ('n', -4, 2), ('p', -4, 0), ('p', -2, -1), ('p', -2, 2), ('p', 1, -1), ('r', 0, -1), ('r', 0, 2))\",\"solution_key\":\"san:Rf5 Qxf7 Kxf7 h8=N Kf6 Rf8\",\"answer_key\":\"answer:Qxf7 Kxf7 h8=N Kf6 Rf8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rd5#\",\"threat_uci\":\"f5d5\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5, e6, e7 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxf7+ wins; 23 quiet moves allow mate in 1.\",\"2 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf7 forced\"},{\"ply\":4,\"text\":\"Kf6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rd5#\",\"THREAT_UCI: f5d5\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5, e6, e7 in the mate net.\",\"FORCE: Only Qxf7+ wins; 23 quiet moves allow mate in 1.\",\"FORCE: 2 checking tries do not solve the puzzle.\",\"NOTE 2: Kxf7 forced\",\"NOTE 4: Kf6 forced\"]}","created_at":"2026-07-02 20:06:06","_table":"pcp_chess_puzzles"},{"id":140,"puzzle_hash":"40fd8d70ddace05068b2020bf787876e0a00756844930cb62f9250ff7c245bb4","fen":"8/2N2bq1/2p1pkp1/p2Qb1n1/1B4K1/5P1P/8/3R4 b - - 0 1","line_san":"1...Qh6?? 2.Qxe5+!! Kxe5 3.Bc3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxh3#","material_note":"added pc6, pa5; material -2 -> 0; eval +469 -> +647 cp","payload":"{\"puzzle_hash\":\"40fd8d70ddace05068b2020bf787876e0a00756844930cb62f9250ff7c245bb4\",\"fen\":\"8/2N2bq1/2p1pkp1/p2Qb1n1/1B4K1/5P1P/8/3R4 b - - 0 1\",\"line_san\":\"1...Qh6?? 2.Qxe5+!! Kxe5 3.Bc3#\",\"generator_seed\":2584350091,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('K', 1, -2), ('N', -3, 1), ('P', 0, -3), ('P', 2, -3), ('Q', -2, -1), ('R', -2, -5), ('b', -1, -1), ('b', 0, 1), ('k', 0, 0), ('n', 1, -1), ('p', -5, -1), ('p', -3, 0), ('p', -1, 0), ('p', 1, 0), ('q', 1, 1))\",\"solution_key\":\"san:Qh6 Qxe5 Kxe5 Bc3\",\"answer_key\":\"answer:Qxe5 Kxe5 Bc3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxh3#\",\"threat_uci\":\"h6h3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers f5, g5 in the mate net.\",\"material_note\":\"added pc6, pa5; material -2 -> 0; eval +469 -> +647 cp\",\"force_notes\":[\"Only Qxe5+ wins; 37 quiet moves allow mate in 1.\",\"4 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxh3#\",\"THREAT_UCI: h6h3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers f5, g5 in the mate net.\",\"MATERIAL: added pc6, pa5; material -2 -> 0; eval +469 -> +647 cp\",\"FORCE: Only Qxe5+ wins; 37 quiet moves allow mate in 1.\",\"FORCE: 4 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe5 forced\"]}","created_at":"2026-07-02 17:19:30","_table":"pcp_chess_puzzles"},{"id":139,"puzzle_hash":"31ed62d4c6e1a5ac942f29eca2b3248c0f4ebbb88caf1e5eb9184dbfd291f468","fen":"1RQ5/5r2/8/4b1q1/p7/4pP1B/2bPKP1p/1Nk5 b - - 0 1","line_san":"1...Qg1?? 2.Qxc2+!! Kxc2 3.Na3+ Kc1 4.Rb1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxf2#","material_note":"added rf7, pa4, ph2; material -7 -> 0; eval +23 -> +498 cp","payload":"{\"puzzle_hash\":\"31ed62d4c6e1a5ac942f29eca2b3248c0f4ebbb88caf1e5eb9184dbfd291f468\",\"fen\":\"1RQ5/5r2/8/4b1q1/p7/4pP1B/2bPKP1p/1Nk5 b - - 0 1\",\"line_san\":\"1...Qg1?? 2.Qxc2+!! Kxc2 3.Na3+ Kc1 4.Rb1#\",\"generator_seed\":3453496364,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -5, -2), ('K', -2, -1), ('N', 1, 0), ('P', -3, -2), ('P', -3, -1), ('P', -1, -1), ('Q', 0, -7), ('R', 1, -7), ('b', -2, -4), ('b', 0, -1), ('k', 0, 0), ('p', -5, -1), ('p', -2, -2), ('p', 2, -3), ('q', -4, -4), ('r', -3, -6))\",\"solution_key\":\"san:Qg1 Qxc2 Kxc2 Na3 Kc1 Rb1\",\"answer_key\":\"answer:Qxc2 Kxc2 Na3 Kc1 Rb1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxf2#\",\"threat_uci\":\"g1f2\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers d1, d2 in the mate net.\",\"material_note\":\"added rf7, pa4, ph2; material -7 -> 0; eval +23 -> +498 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc2 forced\"},{\"ply\":4,\"text\":\"Kc1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxf2#\",\"THREAT_UCI: g1f2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers d1, d2 in the mate net.\",\"MATERIAL: added rf7, pa4, ph2; material -7 -> 0; eval +23 -> +498 cp\",\"NOTE 2: Kxc2 forced\",\"NOTE 4: Kc1 forced\"]}","created_at":"2026-07-02 17:09:59","_table":"pcp_chess_puzzles"}]}