Stockfish

Stockfish is a free, open-source chess engine first released in 2008. It is developed by a community of volunteer programmers, runs on many operating systems, and powers the analysis features of many chess apps and websites.

It is a top engine that has won computer chess competitions many times. Since 2020 it has combined its search with a neural-network evaluation function called NNUE. Its evaluation scores express which side is better, and by how much, in units of roughly one pawn.

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