Paste a PGN or link a Chess.com or Lichess game and get an instant move-by-move Stockfish analysis: every blunder, mistake, inaccuracy, miss, and brilliant move classified, plus an accuracy score and estimated rating for both players.
The review walks the full game on an interactive board. At each move you can see what the engine preferred instead, how much the evaluation shifted, and the continuation you missed — so a red mark on the graph becomes a concrete lesson, not just a label. Key moments like the move that decided the game are surfaced automatically.
Most games are decided by two or three moments, and the analyzer is built to take you straight to them. Skip past the moves marked best or good, replay the critical positions, and try to find the right move yourself before revealing the engine line — the same habit strong players use when reviewing with a coach.
The Stockfish engine runs locally in your browser, so analysis is private and fast — no uploads, no server queue, and no account required. You can also import games to review later or drill your errors in the mistake trainer.