Is my move a blunder? Blunder check with Coach Bjorn
Paste a game or a position, pick a move, and Stockfish says what it cost. When a tactic explains it, Coach Bjorn says what went wrong.
Click a move in the list, then check it.
Scholar's Mate, White won
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How moves are graded
| Verdict | The move… |
|---|---|
| Blunder | gives away 2 pawns or more |
| Mistake | gives away 1 to 2 pawns |
| Inaccuracy | gives away half a pawn to 1 pawn |
| Good or excellent | gives away less than half a pawn |
| Best move | is Stockfish's own choice |
Compared with Stockfish's best move at depth 16. In a game that is already decided, with 90% winning chances or more for one side, no move is called a mistake.
Questions
What counts as a blunder in chess?
Here, a move that gives away 2 pawns or more of value compared with Stockfish's best move. A mistake gives away 1 to 2 pawns, an inaccuracy half a pawn to 1. KingChess's Game Review uses the same lines.
Why isn't my weaker move a blunder when I'm winning anyway?
Once one side has 90% winning chances or more, a weaker move that keeps the win isn't called a mistake. The same goes for a side that was already lost.
When does Coach Bjorn explain the move?
On mistakes and blunders, when he can point at the reason on the board: a piece left hanging, a fork, a pin, a mate. When the cost is about the position rather than a tactic, you get Stockfish's verdict and the reply that punishes the move.
How deep does Stockfish look?
Depth 16 for the position before your move and the position after it. A check takes a few seconds at most.
How do I check a move from my Chess.com or Lichess game?
Paste the game's PGN, click the move in the list and press Check. To check a position from a book or a puzzle, paste its FEN and drag the move on the board.
How many moves can I check?
30 an hour. To go through a whole game, type your username below and Coach Bjorn reviews your latest game free.
What gets sent to KingChess?
Only the position and the move you check, so the engine can look at them. The rest of your paste stays in your browser.
Coach Bjorn
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