Find the move that
lost you the game
Play Stockfish or import your Chess.com history. ChessX grades every move you made and shows the one you missed.
Anderssen versus Kieseritzky, London 1851. The final position.
Graded the moment you move
Stockfish scores your move at depth 12 and says which of four things it was, before the engine replies.
- Good Best, or close enough to it.
- Inaccuracy Gave up a little ground.
- Mistake Cost you real material or position.
- Blunder Handed the game over.
Your Chess.com games too
Sync your account once. Every imported game goes through the same analysis in the background.
Rewind to the mistake
Step through any game, jump straight to your blunders, and see the move you should have played drawn on the board.
