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kokopu

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A JavaScript/TypeScript library implementing the chess game rules and providing tools to read/write the standard chess file formats.

www.npmjs.com/package/kokopu

yo35/kokopu

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LABEL FEN_IN VARIANT STRICT CASTLING EN_PASSANT FIFTY_MOVE_CLOCK FULL_MOVE_NUMBER FEN_OUT_DEFAULT FEN_OUT_WITH_MODIFIED_COUNTERS FEN_OUT_WITHOUT_XFEN Base 1 rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b Kk - 10 5 regular true Kk - 10 5 rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b Kk - 0 1 rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b Kk - 20 6 Base 2 r1bqkbnr/ppppp1pp/2n5/4Pp2/8/8/PPPP1PPP/RNBQKBNR w KQkq f6 0 0 regular true KQkq f 0 0 r1bqkbnr/ppppp1pp/2n5/4Pp2/8/8/PPPP1PPP/RNBQKBNR w KQkq f6 0 1 r1bqkbnr/ppppp1pp/2n5/4Pp2/8/8/PPPP1PPP/RNBQKBNR w KQkq f6 0 1 Base 3 k7/n1PB4/1K6/8/8/8/8/8 w - - 0 60 regular true - - 0 60 k7/n1PB4/1K6/8/8/8/8/8 w - - 0 1 k7/n1PB4/1K6/8/8/8/8/8 w - - 0 61 Base 4 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQq - 0 1 regular true KQq - 0 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQq - 0 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQq - 0 2 Invalid castling flag order rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w qK - 0 1 regular false Kq - 0 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w Kq - 0 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w Kq - 0 2 Invalid en-passant (rank) rnbqkbnr/pppp1ppp/8/8/3Pp3/2N2N2/PPP1PPPP/R1BQKB1R b KQkq d6 0 3 regular false KQkq d 0 3 rnbqkbnr/pppp1ppp/8/8/3Pp3/2N2N2/PPP1PPPP/R1BQKB1R b KQkq d3 0 1 rnbqkbnr/pppp1ppp/8/8/3Pp3/2N2N2/PPP1PPPP/R1BQKB1R b KQkq d3 0 4 Ineffective en-passant 1 rnbqkbnr/pppppppp/8/8/5P2/8/PPPPP1PP/RNBQKBNR b KQkq f3 2 1 regular false KQkq f 2 1 rnbqkbnr/pppppppp/8/8/5P2/8/PPPPP1PP/RNBQKBNR b KQkq - 0 1 rnbqkbnr/pppppppp/8/8/5P2/8/PPPPP1PP/RNBQKBNR b KQkq - 4 2 Ineffective en-passant 2 rnbqkb1r/pppppppp/5n2/8/8/N7/PPPPPPPP/R1BQKBNR w KQkq h6 41 27 regular false KQkq h 41 27 rnbqkb1r/pppppppp/5n2/8/8/N7/PPPPPPPP/R1BQKBNR w KQkq - 0 1 rnbqkb1r/pppppppp/5n2/8/8/N7/PPPPPPPP/R1BQKBNR w KQkq - 82 28 Ineffective en-passant 3 4k3/8/8/K1pP3r/8/8/8/8 w - c6 0 1 regular false - c 0 1 4k3/8/8/K1pP3r/8/8/8/8 w - - 0 1 4k3/8/8/K1pP3r/8/8/8/8 w - - 0 2 Invalid move counters 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 00 1 regular false KQkq - 0 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 2 Invalid move counters 2 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 01 regular false KQkq - 0 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 2 XFEN base nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 1 chess960 true BFbf - 0 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 2 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQkq - 0 1 XFEN with FEN style nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQkq - 0 1 chess960 false BFbf - 0 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 2 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQkq - 0 1 XFEN with mixed style 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQbf - 0 1 chess960 false BFbf - 0 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 2 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQkq - 0 1 XFEN with mixed style 2 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BKqf - 0 1 chess960 false BFbf - 0 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 1 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFbf - 0 2 nrkbqrbn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQkq - 0 1 Asymetric XFEN rbbkrnqn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFae - 5 24 chess960 true BFae - 5 24 rbbkrnqn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFae - 0 1 rbbkrnqn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFae - 10 25 rbbkrnqn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQkq - 0 1 Asymetric XFEN with FEN style rbbkrnqn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQkq - 5 24 chess960 false BFae - 5 24 rbbkrnqn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFae - 0 1 rbbkrnqn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w BFae - 10 25 rbbkrnqn/pppppppp/8/8/8/8/PPPPPPPP/NRKBQRBN w KQkq - 0 1 Ambiguous FEN style with king not on 1st rank bnrknqrb/pppppppp/8/8/8/K7/PPPPPPPP/BNR1NQRB w CGcg - 0 1 chess960 true CGcg - 0 1 bnrknqrb/pppppppp/8/8/8/K7/PPPPPPPP/BNR1NQRB w cg - 0 1 bnrknqrb/pppppppp/8/8/8/K7/PPPPPPPP/BNR1NQRB w cg - 0 2 bnrknqrb/pppppppp/8/8/8/K7/PPPPPPPP/BNR1NQRB w kq - 0 1 Ambiguous FEN style with multiple kings bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNKRB w CGcg - 0 1 chess960 true CGcg - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNKRB w cg - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNKRB w cg - 0 2 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNKRB w kq - 0 1 Valid FEN style with 3 rooks 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w c - 0 1 chess960 true c - 0 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w c - 0 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w c - 0 2 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w q - 0 1 Ambiguous FEN style with 3 rooks 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w f - 0 1 chess960 true f - 0 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w f - 0 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w f - 0 2 Ambiguous FEN style with flag not on rook file 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w a - 0 1 chess960 true a - 0 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w - - 0 1 bnrknrrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w - - 0 2 Valid FEN style with 3 rooks 2 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w G - 0 1 chess960 true G - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w G - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w G - 0 2 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w K - 0 1 Ambiguous FEN style with 3 rooks 2 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w B - 0 1 chess960 true B - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w B - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w B - 0 2 Ambiguous FEN style with flag not on rook file 2 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w F - 0 1 chess960 true F - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w - - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BRRKNQRB w - - 0 2 Ambiguous FEN style with flag on king file bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w d - 0 1 chess960 true d - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w - - 0 1 bnrknqrb/pppppppp/8/8/8/8/PPPPPPPP/BNRKNQRB w - - 0 2 Castling flag decoding without rooks q1n5/pppppppp/4k3/8/8/8/PPPPPPPP/4K3 w KQkq - 0 1 chess960 false AHah - 0 1 q1n5/pppppppp/4k3/8/8/8/PPPPPPPP/4K3 w - - 0 1 q1n5/pppppppp/4k3/8/8/8/PPPPPPPP/4K3 w - - 0 2