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1. python-chesspython-chessPublic

   A chess library for Python, with move generation and validation, PGN parsing and writing, Polyglot opening book reading, Gaviota tablebase probing, Syzygy tablebase probing, and UCI/XBoard engine c…

   Python 2.5k 537

2. lichess-org/fishnetlichess-org/fishnetPublic

   Distributed Stockfish analysis for lichess.org

   Rust 774 106

3. shakmatyshakmatyPublic

   A Rust library for chess and chess variant rules and operations

   Rust 229 45

4. syzygy-tables.infosyzygy-tables.infoPublic

   User interface and public API for probing Syzygy endgame tablebases

   Python 68 14

5. chessopschessopsPublic

   Chess and chess variant rules and operations in TypeScript

   TypeScript 130 38

6. lichess-org/lila-openingexplorerlichess-org/lila-openingexplorerPublic

   Opening explorer for lichess.org that can handle all the variants and trillions of unique positions

   Rust 137 36