A chess analysis board that explains the game.

What the analysis board does

• Stockfish 19 in your browser. The engine runs locally, with its evaluation, depth and several candidate lines. No queue and no upload of your games.
• Game Review. Every move for both players is marked Theory, Best, As good as best, Sound, Inaccuracy, Mistake or Blunder; exceptional moves can be recognized as Brilliant. Each side gets an accuracy score.
• Comparable numbers. Accuracy and the inaccuracy, mistake and blunder thresholds follow Lichess’s published method.
• The better line, playable. Play line steps through the engine’s suggestion; Retry this move lets you find it yourself.
• Your own analysis. Variations, comments and an evaluation timeline across the game.

Bring any game

• A Chess.com or Lichess game link
• Your recent games by username (up to 50)
• PGN pasted or dropped as a file, including games with variations and comments
• Any position from a FEN

Beyond one game

Analysis shares the board with the rest of ChessCanvas: open the Position Explorer at any move to see master practice, and send the line to a Study chapter to keep it. X-Ray reads a saved game back to you, and Thinking Mode and Guess the Move train how you choose moves.