Open Source Chess Engine

Derived from Glaurung 2.1, Stockfish is a free open-source engine for Chess Games with support for Syzygy Bases. While it’s not a complete Chess Program per se (requires UCI compatible GUI in order to be used comfortably) it’s still worth checking out for anyone working on building a Chess game or app.

Leela Chess Zero - Wikipedia

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En Croissant - a free open source chess GUI : r/chess

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Free UCI-Compatible Chess Programs for the Stockfish Engine

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Stream Lc0: The Official Download Site for Leela Chess Zero, the