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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.

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{ "event": "Game with promoted variation.", "mainVariation": [ "e4", { "notation": "d5", "variations": [ [ "c5" ], [ "e5", { "notation": "Nf3", "comment": "Used to be the main line" } ], [ "c6" ], [ "g6" ], [ "d6", { "notation": "d4", "comment": "Used to be a nested variation" } ] ] }, "exd5", { "notation": "Qxd5", "comment": "Used to be the variation at index 1" } ] }