Strong open-source chess engine

Download, documentation, technical details, and frequent questions.

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Stockfish has won the Top Chess Engine Championship and Computer Chess Championship, and consistently ranks highly on rating lists.

Competition Results

Open Source

Stockfish is open source (GPLv3 license). That means you can read the code, modify it, and contribute back.

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Run Anywhere

You can use Stockfish on your computer or on your iOS or Android device. So you can get world-class chess analysis, wherever you are.