Understanding the world's strongest chess engine
Stockfish is an open-source chess engine that is widely considered the strongest chess engine in the world. It uses advanced algorithms including alpha-beta pruning, iterative deepening, and a neural network evaluation function (NNUE) to evaluate chess positions with superhuman accuracy.
Stockfish is developed by a community of volunteers and is completely free and open source. It consistently ranks #1 in computer chess engine rankings and has been used to analyze millions of chess games.
Stockfish powers multiple features throughout our platform
Why we chose Stockfish as our analysis engine
Stockfish provides the most accurate evaluations available, making it the best tool for learning and analysis.
Free, open-source, and continuously improved by a global community of developers.
Runs entirely in your browser using WebAssembly, no server-side processing required.
Used by millions of chess players worldwide and trusted by professional players and coaches.