What the review shows
- Accuracy for you and your opponent, overall and by opening, middlegame and endgame.
- Every move classified, marked on the board, with Stockfish’s move drawn where yours went wrong.
- Key moments: the few moves that decided the game, one click away.
- Stockfish’s top three lines at every move. Play any of them out on the board.
- A winning-chances chart across the whole game.
- The opening by name, and the move you left theory.
- Your clock: time spent on each move, when the PGN has clock times (chess.com’s do).
What the move labels mean
Labels use chess.com’s names; the thresholds are lichess’s, measured in winning chance (0 to 100) for the side that moved.
| Label | Meaning |
|---|---|
| Brilliant !! | A sound sacrifice that was also the best move. |
| Great ! | The only good move in the position. |
| Best | Stockfish’s own choice. |
| Excellent, Good | Gave away under 3, or under 10, points of winning chance. |
| Book | Known opening theory. |
| Inaccuracy ?! | 10 or more points of winning chance lost. |
| Mistake ? | 20 or more lost. |
| Miss | Let the opponent’s mistake go unpunished. |
| Blunder ?? | 30 or more lost. |
Compared with chess.com’s Game Review
From chess.com’s help center, checked October 2026: free and Gold members get one full Game Review a day; unlimited starts at Platinum. Here every review is free, as many as you like. Chess.com adds coach-style explanations on Diamond; this review shows the engine’s lines instead.
Questions
Is the game review really free?
Yes. Stockfish runs in your own browser, so a review costs us nothing and there is no daily limit and no account.
How do I review a chess.com game?
Type your chess.com username and pick a game from the list, or open the game on chess.com, choose Share, then PGN, copy it, and paste it here.
Can I review games from lichess or over-the-board games?
Yes. Paste the PGN of any standard chess game. Clock times and the opening name are read from the PGN when it has them.
How is accuracy calculated?
Each move is scored by how much winning chance it gave away, using the lichess win-percentage formula. Accuracy is the lichess accuracy curve over the average loss for each side, from 0 to 100.
What counts as a blunder, a mistake or an inaccuracy?
A move that gives away 30 or more points of winning chance is a blunder, 20 or more a mistake, and 10 or more an inaccuracy. A miss is a move that fails to punish the opponent’s mistake.
Does it work on a phone?
Yes. Phones run a quicker pass; laptops and desktops can switch to a deeper one. Both review every move.
After the review
One game shows one mistake. Your free Goat Card reads every game you’ve played on chess.com for the habits behind them: tilt, clock trouble, your worst hours. To play out a position without a game, use the analysis board.