Load a game
Paste a PGN, open a .pgn file or try the sample. Stockfish checks every move on your device; nothing is uploaded.
How the review works
Stockfish 18 evaluates every position of the game for the time you choose (2 seconds by default). Each move is graded by how much of your advantage it gave away, measured near equality in plain pawns and much more gently once the game is already decided (going from +7 to +5 costs nothing, losing 0.4 around 0.00 does). Giving away about 0.3 pawns or more near equality is an inaccuracy ?!, about 0.8 or more a mistake ?, and about 1.6 or more, or walking into a mate, a blunder ??. A missed mate is only marked if it also costs you the win. Accuracy is calculated the Lichess way. The summary also shows each player's average loss per move twice: on the review scale used for the marks, and as plain Stockfish pawns (each eval capped at ±10, a mate counting as 10).
Evaluations are always shown from White's side: +1.50 means White is better by about a pawn and a half, −1.50 means Black is, and #3 / #−3 mean mate in 3 for White / Black. The game report shows accuracy, average centipawn loss, an evaluation graph and the best move for every error, and you can copy or download the annotated PGN.