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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 swapped variations.} [start] -+<LONG [1w] (1w) e4 (#hm=0) [1b] (1b) e5 (#hm=0) | [1b-v0-start] +---+ [1b-v0-1b] | (1b) c5 (#hm=0) | [1b-v1-start] +---+ [1b-v1-1b] | (1b) g6 (#hm=0) {Used to be at index 4} | [1b-v2-start] +---+ [1b-v2-1b] | (1b) d5 (#hm=0) | [1b-v3-start] +---+ [1b-v3-1b] | (1b) f5 (#hm=0) | [1b-v4-start] +---+ [1b-v4-1b] | (1b) c6 (#hm=0) {Used to be at index 1} | [1b-v5-start] +---+ [1b-v5-1b] | (1b) b5 (#hm=0) | [1b-v6-start] +---+ [1b-v6-1b] | (1b) a5 (#hm=0) | [2w] (2w) Nf3 (#hm=1) +---+---+---+---+---+---+---+---+ | r | n | b | q | k | b | n | r | +---+---+---+---+---+---+---+---+ | p | p | p | p | | p | p | p | +---+---+---+---+---+---+---+---+ | | | | | | | | | +---+---+---+---+---+---+---+---+ | | | | | p | | | | +---+---+---+---+---+---+---+---+ | | | | | P | | | | +---+---+---+---+---+---+---+---+ | | | | | | N | | | +---+---+---+---+---+---+---+---+ | P | P | P | P | | P | P | P | +---+---+---+---+---+---+---+---+ | R | N | B | Q | K | B | | R | +---+---+---+---+---+---+---+---+ b KQkq - {Line}{3 plies}