{ "name": "Fischer Rating — Chess960 tactic positions", "description": "Engine-measured Chess960 tactic positions. 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- 7 24", "side_to_move": "white", "solution_uci": [ "f6g7" ], "motif": "mate-in-1", "themes": [ "chess960", "key-queen", "mate-in-1", "fork" ], "rating": 765, "facets": { "key_move": "queen", "sac": 0, "mate_in": 1, "quiet": false, "fork": true, "line_len": 1, "effect": 561 }, "rankings": [ "quick-mates" ] }, { "id": "fg-335344", "url": "https://fischerrating.com/en/p/fg-335344/", "fen": "k7/2Qp1n2/1p3p2/2p4q/1PP1B3/4Pb1n/PK1P1N2/6r1 b - - 1 22", "side_to_move": "black", "solution_uci": [ "f3e4", "f2e4", "h5e5" ], "motif": "bishop", "themes": [ "chess960", "key-bishop", "sacrifice" ], "rating": 1470, "facets": { "key_move": "bishop", "sac": 2, "mate_in": null, "quiet": false, "fork": false, "line_len": 29, "effect": 499 }, "rankings": [ "bishop-strikes" ] }, { "id": "fg-7503bd", "url": "https://fischerrating.com/en/p/fg-7503bd/", "fen": "1k2nr1q/3r3p/p1B1p1p1/1p2Np2/1P1n1P2/6P1/P2PP2P/1NR1KRQ1 w - - 0 17", "side_to_move": "white", "solution_uci": [ "c6d7", "h8e5", "f4e5" ], "motif": "mate-in-10", "themes": [ "chess960", "key-bishop", "mate-in-10" ], "rating": 1530, "facets": { "key_move": "bishop", "sac": 0, "mate_in": 10, "quiet": false, "fork": false, "line_len": 19, "effect": 585 }, "rankings": [ "bishop-strikes" ] }, { "id": "fg-be6fb8", "url": "https://fischerrating.com/en/p/fg-be6fb8/", "fen": "kr6/1b1Q2p1/5p2/4p2p/4P2P/1n2NP2/P5P1/BK5R w - - 1 23", "side_to_move": "white", "solution_uci": [ "d7a4", "b3a5", "a4a5" ], "motif": "mate-in-15", "themes": [ "chess960", "key-queen", "mate-in-15", "fork" ], "rating": 1530, "facets": { "key_move": "queen", "sac": 0, "mate_in": 15, "quiet": false, "fork": true, "line_len": 29, "effect": 785 }, "rankings": [ "best-forks", "longest-combinations" ] }, { "id": "fg-dfa9a2", "url": "https://fischerrating.com/en/p/fg-dfa9a2/", "fen": "br3bk1/p3ppp1/2qP1n2/8/2P4p/2N1P2R/PP1N1Pr1/BR2QB1K b q - 1 16", "side_to_move": "black", "solution_uci": [ "g2h2", "h1h2", "c6h1" ], "motif": "mate-in-2", "themes": [ "chess960", "key-rook", "mate-in-2", "sacrifice", "discovered-attack", "fork" ], "rating": 1005, "facets": { "key_move": "rook", "sac": 5, "mate_in": 2, "quiet": false, "fork": true, "line_len": 3, "effect": 1267 }, "rankings": [ "discovered-attacks", "spectacular-sacrifices", "mating-combinations", "best-forks" ] }, { "id": "fg-9b6902", "url": "https://fischerrating.com/en/p/fg-9b6902/", "fen": "q3rr2/3b1pk1/3Pnb1N/p6p/1p1N3P/4P3/6P1/QB1RB1K1 w Q - 3 25", "side_to_move": "white", "solution_uci": [ "d4f5", "g7h7", "f5e7" ], "motif": "mate-in-8", "themes": [ "chess960", "key-knight", "mate-in-8", "discovered-attack" ], "rating": 1395, "facets": { "key_move": "knight", "sac": 0, "mate_in": 8, "quiet": false, "fork": false, "line_len": 15, "effect": 693 }, "rankings": [ "discovered-attacks", "knight-strikes" ] }, { "id": "fg-0ce209", "url": "https://fischerrating.com/en/p/fg-0ce209/", "fen": "2krb2b/pp1p4/1np4p/8/1P4p1/1R2Q3/P1PPPN1P/1K1N1qr1 b - - 1 17", "side_to_move": "black", "solution_uci": [ "f1d1", "f2d1", "g1d1" ], "motif": "mate-in-2", "themes": [ "chess960", "key-queen", "mate-in-2", "queen-sacrifice", "sacrifice" ], "rating": 1035, "facets": { "key_move": "queen", "sac": 6, "mate_in": 2, "quiet": false, "fork": false, "line_len": 3, "effect": 1117 }, "rankings": [ "spectacular-sacrifices", "mating-combinations" ] }, { "id": "fg-af4560", "url": "https://fischerrating.com/en/p/fg-af4560/", "fen": "4brkn/pp4pp/4P3/5p2/2rq1P2/5KN1/PPP1B1PP/1R3R2 b - - 2 18", "side_to_move": "black", "solution_uci": [ "d4f4" ], "motif": "mate-in-1", "themes": [ "chess960", "key-queen", "mate-in-1", "fork" ], "rating": 765, "facets": { "key_move": "queen", "sac": 0, "mate_in": 1, "quiet": false, "fork": true, "line_len": 1, "effect": 561 }, "rankings": [ "quick-mates" ] }, { "id": "fg-fa23f9", "url": "https://fischerrating.com/en/p/fg-fa23f9/", "fen": "3R1rk1/p3q1pp/6n1/1P6/P3B3/1P4p1/5PP1/B1N1QRK1 w - - 0 16", "side_to_move": "white", "solution_uci": [ "e4d5", "e7f7", "e1c3" ], "motif": "mate-in-6", "themes": [ "chess960", "key-bishop", "mate-in-6", "discovered-attack" ], "rating": 1215, "facets": { "key_move": "bishop", "sac": 0, "mate_in": 6, "quiet": false, "fork": false, "line_len": 11, "effect": 661 }, "rankings": [ "discovered-attacks", "bishop-strikes" ] }, { "id": "fg-c16f2e", "url": "https://fischerrating.com/en/p/fg-c16f2e/", "fen": "b1r2rk1/p3q1pp/1n2p3/4N3/P1p1NPPQ/b7/2B4P/1R3RK1 w - - 1 24", "side_to_move": "white", "solution_uci": [ "h4h7", "g8h7", "e4f6" ], "motif": "mate-in-3", "themes": [ "chess960", "key-queen", "mate-in-3", "queen-sacrifice", "sacrifice" ], "rating": 1185, "facets": { "key_move": "queen", "sac": 8, "mate_in": 3, "quiet": false, "fork": false, "line_len": 5, "effect": 1353 }, "rankings": [ "spectacular-sacrifices", "mating-combinations" ] }, { "id": "fg-9d3dc0", "url": "https://fischerrating.com/en/p/fg-9d3dc0/", "fen": "b1r2rk1/p2nq1pp/4p3/4N1P1/P1p1NP1Q/b7/2B4P/1R3RK1 w - 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- 0 20", "side_to_move": "white", "solution_uci": [ "g7h5", "g8h8", "h5f6" ], "motif": "mate-in-12", "themes": [ "chess960", "key-knight", "mate-in-12", "discovered-attack", "quiet" ], "rating": 1530, "facets": { "key_move": "knight", "sac": 0, "mate_in": 12, "quiet": true, "fork": false, "line_len": 23, "effect": 917 }, "rankings": [ "discovered-attacks", "quiet-wins", "knight-strikes", "longest-combinations" ] }, { "id": "fg-b009ef", "url": "https://fischerrating.com/en/p/fg-b009ef/", "fen": "1kN1r1b1/7p/1p1P2p1/p4pn1/P2Q4/1qP3P1/1P6/2KR3B w - - 0 25", "side_to_move": "white", "solution_uci": [ "d6d7", "b3d1", "c1d1" ], "motif": "mate-in-10", "themes": [ "chess960", "key-pawn", "mate-in-10", "sacrifice", "quiet" ], "rating": 1680, "facets": { "key_move": "pawn", "sac": 5, "mate_in": 10, "quiet": true, "fork": false, "line_len": 19, "effect": 1295 }, "rankings": [ "spectacular-sacrifices", "mating-combinations", "quiet-wins", "pawn-strikes" ] }, { "id": "fg-7b90dd", "url": "https://fischerrating.com/en/p/fg-7b90dd/", "fen": "Qnkr4/1pp3pp/8/3np3/P2q4/1P1b1PN1/K1PR2PP/5B2 b - - 7 20", "side_to_move": "black", "solution_uci": [ "d5b4", "a2b1", "d3c2" ], "motif": "mate-in-9", "themes": [ "chess960", "key-knight", "mate-in-9", "sacrifice" ], "rating": 1545, "facets": { "key_move": "knight", "sac": 2, "mate_in": 9, "quiet": false, "fork": false, "line_len": 17, "effect": 789 }, "rankings": [ "knight-strikes" ] }, { "id": "fg-fbbb84", "url": "https://fischerrating.com/en/p/fg-fbbb84/", "fen": "Qnkr4/1pp3pp/8/4p3/Pn1q4/KP1b1PN1/2PR2PP/5B2 b - - 9 21", "side_to_move": "black", "solution_uci": [ "d4a1", "a3b4", "c7c5" ], "motif": "mate-in-5", "themes": [ "chess960", "key-queen", "mate-in-5", "sacrifice", "fork" ], "rating": 1215, "facets": { "key_move": "queen", "sac": 3, "mate_in": 5, "quiet": false, "fork": true, "line_len": 9, "effect": 955 }, "rankings": [ "best-forks" ] }, { "id": "fg-a44d5d", "url": "https://fischerrating.com/en/p/fg-a44d5d/", "fen": "Qnkr4/1pp3pp/8/4p3/PK6/1P1b1PN1/2PR2PP/q4B2 b - - 0 22", "side_to_move": "black", "solution_uci": [ "c7c5", "b4a5", "a1c3" ], "motif": "mate-in-4", "themes": [ "chess960", "key-pawn", "mate-in-4" ], "rating": 1035, "facets": { "key_move": "pawn", "sac": 0, "mate_in": 4, "quiet": false, "fork": false, "line_len": 7, "effect": 489 }, "rankings": [ "pawn-strikes" ] }, { "id": "fg-4b4002", "url": "https://fischerrating.com/en/p/fg-4b4002/", "fen": "1r1b1rk1/Q1ppp1Bp/3n2q1/8/2P5/5b2/P2P3P/2RBNK1R b K - 0 15", "side_to_move": "black", "solution_uci": [ "f3e2", "f1e2", "g6g4" ], "motif": "mate-in-8", "themes": [ "chess960", "key-bishop", "mate-in-8", "sacrifice", "discovered-attack", "fork" ], "rating": 1485, "facets": { "key_move": "bishop", "sac": 3, "mate_in": 8, "quiet": false, "fork": true, "line_len": 15, "effect": 1143 }, "rankings": [ "discovered-attacks", "spectacular-sacrifices", "best-forks", "bishop-strikes" ] }, { "id": "fg-91d128", "url": "https://fischerrating.com/en/p/fg-91d128/", "fen": "2r2k2/pR4pQ/4bp2/1P6/8/P7/4PPPP/2q2NK1 b - - 3 24", "side_to_move": "black", "solution_uci": [ "c1f1", "g1f1", "c8c1" ], "motif": "mate-in-2", "themes": [ "chess960", "key-queen", "mate-in-2", "queen-sacrifice", "sacrifice" ], "rating": 1035, "facets": { "key_move": "queen", "sac": 6, "mate_in": 2, "quiet": false, "fork": false, "line_len": 3, "effect": 1117 }, "rankings": [ "spectacular-sacrifices", "mating-combinations" ] }, { "id": "fg-24515c", "url": "https://fischerrating.com/en/p/fg-24515c/", "fen": "1n6/p2k1Q2/1b1pr3/1P3p2/1P2bP2/2N5/3P2PP/q1rBKR2 b K - 0 16", "side_to_move": "black", "solution_uci": [ "e6e7", "f7e7", "d7e7" ], "motif": "mate-in-13", "themes": [ "chess960", "key-rook", "mate-in-13", "sacrifice", "quiet" ], "rating": 1680, "facets": { "key_move": "rook", "sac": 5, "mate_in": 13, "quiet": true, "fork": false, "line_len": 25, "effect": 1343 }, "rankings": [ "spectacular-sacrifices", "mating-combinations", "longest-combinations" ] }, { "id": "fg-971613", "url": "https://fischerrating.com/en/p/fg-971613/", "fen": "2k1r2b/1p1p3p/2p5/3b1N2/1K1BpP2/6P1/1P1P3P/q2Q1R1B b k - 1 18", "side_to_move": "black", "solution_uci": [ "c6c5", "b4c3", "c5d4" ], "motif": "mate-in-20", "themes": [ "chess960", "key-pawn", "mate-in-20", "fork" ], "rating": 1530, "facets": { "key_move": "pawn", "sac": 0, "mate_in": 20, "quiet": false, "fork": true, "line_len": 39, "effect": 865 }, "rankings": [ "best-forks", "pawn-strikes", "longest-combinations" ] }, { "id": "fg-fcd2cd", "url": "https://fischerrating.com/en/p/fg-fcd2cd/", "fen": "6k1/p3pbp1/4N2b/5Q2/2n5/8/PPB2PPP/R2N1K2 w - - 5 25", "side_to_move": "white", "solution_uci": [ "f5h7" ], "motif": "mate-in-1", "themes": [ "chess960", "key-queen", "mate-in-1", "fork" ], "rating": 765, "facets": { "key_move": "queen", "sac": 0, "mate_in": 1, "quiet": false, "fork": true, "line_len": 1, "effect": 561 }, "rankings": [ "quick-mates" ] }, { "id": "fg-6183aa", "url": "https://fischerrating.com/en/p/fg-6183aa/", "fen": "q2b1r1k/p3pppp/7N/1p6/2PB4/5b2/P3PPPP/Q2R2K1 w - - 0 18", "side_to_move": "white", "solution_uci": [ "d4g7" ], "motif": "mate-in-1", "themes": [ "chess960", "key-bishop", "mate-in-1", "discovered-attack", "fork" ], "rating": 765, "facets": { "key_move": "bishop", "sac": 0, "mate_in": 1, "quiet": false, "fork": true, "line_len": 1, "effect": 701 }, "rankings": [ "discovered-attacks", "quick-mates", "bishop-strikes" ] }, { "id": "fg-e111f8", "url": "https://fischerrating.com/en/p/fg-e111f8/", "fen": "3kr3/pp1p4/3q1b2/3np1pQ/8/1N3P2/P2PP2P/2RKBR1B b K - 2 19", "side_to_move": "black", "solution_uci": [ "d5e3" ], "motif": "mate-in-1", "themes": [ "chess960", "key-knight", "mate-in-1", "fork" ], "rating": 765, "facets": { "key_move": "knight", "sac": 0, "mate_in": 1, "quiet": false, "fork": true, "line_len": 1, "effect": 561 }, "rankings": [ "quick-mates", "knight-strikes" ] }, { "id": "fg-693829", "url": "https://fischerrating.com/en/p/fg-693829/", "fen": "4r1q1/2p4p/1pkNQ1p1/p2p4/P2P2P1/B1P5/1KP4P/5R2 w - - 3 25", "side_to_move": "white", "solution_uci": [ "e6e8", "g8e8", "d6e8" ], "motif": "mate-in-20", "themes": [ "chess960", "key-queen", "mate-in-20", "sacrifice", "fork" ], "rating": 1650, "facets": { "key_move": "queen", "sac": 4, "mate_in": 20, "quiet": false, "fork": true, "line_len": 39, "effect": 1305 }, "rankings": [ "spectacular-sacrifices", "mating-combinations", "best-forks", "longest-combinations" ] }, { "id": "fg-c716c9", "url": "https://fischerrating.com/en/p/fg-c716c9/", "fen": "r2b1k2/1q6/b3Qnp1/p2p3B/P2P1B2/1pP3Pp/1P3P1P/R5K1 w - - 0 23", "side_to_move": "white", "solution_uci": [ "f4h6", "b7g7", "h5g6" ], "motif": "mate-in-9", "themes": [ "chess960", "key-bishop", "mate-in-9" ], "rating": 1485, "facets": { "key_move": "bishop", "sac": 0, "mate_in": 9, "quiet": false, "fork": false, "line_len": 17, "effect": 569 }, "rankings": [ "bishop-strikes" ] }, { "id": "fg-7e6f88", "url": "https://fischerrating.com/en/p/fg-7e6f88/", "fen": "1r2nk2/5r2/3pQ1R1/NP2p3/3pP3/3P4/1PPq1P2/1K1R4 w q - 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