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.
1.e4
1...e5
 |
 +- 1...c5
 |
 +- 1...g6 Used to be at index 4
 |
 +- 1...d5
 |
 +- 1...f5
 |
 +- 1...c6 Used to be at index 1
 |
 +- 1...b5
 |
 +- 1...a5
 |
2.Nf3
*