See what the engine sees.

Review a game from Chess.com, Lichess or a PGN. Every move gets a label, from brilliant to blunder, and an explanation taken from Stockfish's own lines. It all runs in your browser, free.

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Or open a single position

−White's weakness, read live from the boardWhite's pawn on e4 is hit by 2 Black pieces and defended by 1.

Every move gets a label

Each move is compared with Stockfish's best in winning chances, on Lichess's win-probability curve. The same rules apply to every game, from your blitz games to world championships.

BrilliantThe engine's best move, and it really gives material away: checked with exchange maths on the board, not guessed from the score, and clearly better than not sacrificing.
GreatThe only good move: every alternative throws away at least 10% of your winning chances.
BestThe engine's top choice in the position.
ExcellentNot the top move, but it costs under 2% of your winning chances.
GoodCosts between 2% and 5% of your winning chances.
BookOpening theory: a move strong players really choose here, from 1.8 million of their games.
InaccuracyGives away 5–10% of your winning chances.
MistakeGives away 10–20% of your winning chances.
MissYour opponent just made a mistake and you let it go unpunished.
BlunderGives away 20% or more, or walks into a forced mate.
ForcedThe only legal move.

How a strong player reads a board

One position, read four ways. Every line below is worked out live from the board by the same code that reads your positions.

What's under attack right now?

White has 1 checking move: Bxh7+.

Where are the weaknesses?

White's pawn on d4 is hit by 2 Black pieces and defended by 1.
White still has 1 minor piece at home (c1) on move 10.
Black's bishop on e7 is Black's worst piece: 2 safe squares and nothing to attack. Improving it is a plan in itself.
Black still has 1 minor piece at home (c8) on move 10.

What's working for each side?

White's knight on c3 is White's most active piece: 5 safe squares, 8 controlled.
White has more space: 12 to 9 behind the pawns in the centre.
Black's knight on f6 is Black's most active piece: 6 safe squares, 8 controlled.
Black's queen on d8 presses down the half-open d-file.

What could happen next?

White rook f1 → e1, onto the half-open e-file. Conditions hold now.
White pawn break d5, hitting e6. Needs: d5 is covered at least as often as it's attacked (1 v 3).
Black knight c6 → b4 → d5, an outpost. Needs: White can't trade off the knight right away.

What each idea looks like on the board

Once you've seen these a few times, you start spotting them in your own games before the engine points them out.

Threats

Pieces under attack flash red. Forks and skewers draw their lines.

Domination

Every square a piece controls floods in its side's colour.

Passed pawns

The runway to promotion lights up, square by square.

Holes

Squares no pawn can ever defend again open up as pits.

Pawn chains

Chains link up, and the base, the point to strike, is targeted.

King danger

The squares around an exposed king heat up with every attacker.

Open files

Files without pawns become highways, and linked rooks pulse along them.

Space

Territory behind each side's pawns fills in: who has room to breathe?

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