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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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Event = {Game with annotations 1} [start] -+<LONG [1w] (1w) e4 (#hm=0) [1b] (1b) e5 (#hm=0) [2w] (2w) Bc4 (#hm=1) [2b] (2b) Nc6 (#hm=2) [3w] (3w) Qh5 (#hm=3) [cal = {Gc4f7,Gh5f7}] [csl = {Rf7}] {Threatening checkmate} [3b] (3b) g6 (#hm=0) $1 [cal = {Rg6h5}] {Avoid the checkmate} | [3b-v0-start] +---+ {Other defenses are possible, for instance:} [3b-v0-3b] | (3b) Nf6 (#hm=4) | [4w] (4w) Qf3 (#hm=1) +---+---+---+---+---+---+---+---+ | r | | b | q | k | b | n | r | +---+---+---+---+---+---+---+---+ | p | p | p | p | | p | | p | +---+---+---+---+---+---+---+---+ | | | n | | | | p | | +---+---+---+---+---+---+---+---+ | | | | | p | | | | +---+---+---+---+---+---+---+---+ | | | B | | P | | | | +---+---+---+---+---+---+---+---+ | | | | | | Q | | | +---+---+---+---+---+---+---+---+ | P | P | P | P | | P | P | P | +---+---+---+---+---+---+---+---+ | R | N | B | | K | | N | R | +---+---+---+---+---+---+---+---+ b KQkq - {Line}{7 plies}