Stockfish
The world's strongest free chess engine, running on your own computer, that tells you the best move and how good or bad any position is.
What you can do with it
- Find the exact moves where you lost a game
- Check an opening idea or a puzzle position
- Power free chess apps and your own analysis scripts
Worth knowingIt's a command-line program with no board of its own, so you use it through a chess app or a script, and it tells you which move was best, not why in plain words.
The full tutorial
01Download Stockfish and check it's the real thingFREE02Run its built-in speed testMEMBERS03Talk to the engine directlyMEMBERS04Set up the Python helperMEMBERS05Find every mistake in the gameMEMBERS06Check your own games, deeper or faster, and play fairMEMBERS
Find the move that lost your last chess game · ~30 min · tested 2026-10-09
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