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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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White = {Paulsen, Louis} Black = {Morphy, Paul} Event = {1<sup>st</sup> American Chess Congress} Round = {4} SubRound = {6} Site = {New York, NY USA} Date = {1857-11-03} ECO = {C48} [start] -+<LONG [1w] (1w) e4 (#hm=0) [1b] (1b) e5 (#hm=0) [2w] (2w) Nf3 (#hm=1) [2b] (2b) Nc6 (#hm=2) [3w] (3w) Nc3 (#hm=3) [3b] (3b) Nf6 (#hm=4) [4w] (4w) Bb5 (#hm=5) [4b] (4b) Bc5 (#hm=6) [5w] (5w) O-O (#hm=7) [5b] (5b) O-O (#hm=8) [6w] (6w) Nxe5 (#hm=0) [6b] (6b) Re8 (#hm=1) [7w] (7w) Nxc6 (#hm=0) [7b] (7b) dxc6 (#hm=0) [8w] (8w) Bc4 (#hm=1) [8b] (8b) b5 (#hm=0) [9w] (9w) Be2 (#hm=1) [9b] (9b) Nxe4 (#hm=0) [10w] (10w) Nxe4 (#hm=0) [10b] (10b) Rxe4 (#hm=0) [11w] (11w) Bf3 (#hm=1) [11b] (11b) Re6 (#hm=2) [12w] (12w) c3 (#hm=0) [12b] (12b) Qd3 (#hm=1) [13w] (13w) b4 (#hm=0) [13b] (13b) Bb6 (#hm=1) [14w] (14w) a4 (#hm=0) [14b] (14b) bxa4 (#hm=0) [15w] (15w) Qxa4 (#hm=0) [15b] (15b) Bd7 (#hm=1) [16w] (16w) Ra2 (#hm=2) [16b] (16b) Rae8 (#hm=3) [17w] (17w) Qa6 (#hm=4) {Morphy took twelve minutes over his next move, probably to assure himself that the combination was sound and that he had a forced win in every variation.}<LONG [17b] (17b) Qxf3 (#hm=0) $3 [18w] (18w) gxf3 (#hm=0) [18b] (18b) Rg6+ (#hm=1) [19w] (19w) Kh1 (#hm=2) [19b] (19b) Bh3 (#hm=3) [20w] (20w) Rd1 (#hm=4) | [20w-v0-start] +---+ {Not} [20w-v0-20w] | (20w) Rg1 (#hm=4) [20w-v0-20b] | (20b) Rxg1+ (#hm=0) [20w-v0-21w] | (21w) Kxg1 (#hm=0) [20w-v0-21b] | (21b) Re1+ (#hm=1) $19 | [20b] (20b) Bg2+ (#hm=5) [21w] (21w) Kg1 (#hm=6) [21b] (21b) Bxf3+ (#hm=0) [22w] (22w) Kf1 (#hm=1) [22b] (22b) Bg2+ (#hm=2) | [22b-v0-start] +---+<LONG [22b-v0-22b] | (22b) Rg2 (#hm=2) $1 {would have won more quickly. For instance:} [22b-v0-23w] | (23w) Qd3 (#hm=3) [22b-v0-23b] | (23b) Rxf2+ (#hm=0) [22b-v0-24w] | (24w) Kg1 (#hm=1) [22b-v0-24b] | (24b) Rg2+ (#hm=2) [22b-v0-25w] | (25w) Kh1 (#hm=3) [22b-v0-25b] | (25b) Rg1# (#hm=4) | [23w] (23w) Kg1 (#hm=3) [23b] (23b) Bh3+ (#hm=4) [24w] (24w) Kh1 (#hm=5) [24b] (24b) Bxf2 (#hm=0) [25w] (25w) Qf1 (#hm=1) {Absolutely forced.} [25b] (25b) Bxf1 (#hm=0) [26w] (26w) Rxf1 (#hm=0) [26b] (26b) Re2 (#hm=1) [27w] (27w) Ra1 (#hm=2) [27b] (27b) Rh6 (#hm=3) [28w] (28w) d4 (#hm=0) [28b] (28b) Be3 (#hm=1) +---+---+---+---+---+---+---+---+ | | | | | | | k | | +---+---+---+---+---+---+---+---+ | p | | p | | | p | p | p | +---+---+---+---+---+---+---+---+ | | | p | | | | | r | +---+---+---+---+---+---+---+---+ | | | | | | | | | +---+---+---+---+---+---+---+---+ | | P | | P | | | | | +---+---+---+---+---+---+---+---+ | | | P | | b | | | | +---+---+---+---+---+---+---+---+ | | | | | r | | | P | +---+---+---+---+---+---+---+---+ | R | | B | | | R | | K | +---+---+---+---+---+---+---+---+ w - - {Black wins}{56 plies}