How it works
Use a screenshot, FEN or PGN
From a screenshot
Upload a clear, straight-on image of a 2D board. Check the recognized pieces, choose White or Black to move, and use 'Wrong side? Flip' if the board was read in the wrong playing direction.
From a FEN
Paste the full FEN when you have it. The field immediately after the piece placement is the side to move: 'w' means White and 'b' means Black. That detail can change the best move completely.
From a PGN
Paste the game score to analyze the position after its final recorded move. To review every move instead of only the last position, use the free game review below.
Stockfish draws its top move as an arrow, shows the evaluation, and lists alternative continuations. You can play the move on the board to keep exploring the line.
FAQ
Frequently asked questions
How does it find the best move?
Stockfish, the strongest open-source chess engine, analyzes the position live in your browser. The move it ranks first is the best move; it is shown as an arrow on the board, with the evaluation and the full continuation.
Can I upload a screenshot of my game?
Yes. Drop a screenshot of a 2D board from Chess.com, Lichess or any board and we recognize the position, then you confirm whose turn it is and read the best move. You can also paste a FEN or PGN.
Is it free?
Yes. Finding the best move is completely free, with no account and no limits. Stockfish runs in your browser. A screenshot is sent to the board-recognition service only when you choose to upload one.
Which engine does it use?
Stockfish, compiled to run directly in your browser. You see the live evaluation, the best move and the alternative lines.
How do I set the board orientation and side to move?
After loading a position, choose Automatic, White to move or Black to move under the board input. If an uploaded board is facing the wrong direction, use 'Wrong side? Flip' to rotate the position before trusting the engine line.
How is this different from the analysis board?
The analysis board is a blank board to explore lines from scratch. This chess calculator takes one position you supply (by screenshot, FEN or PGN) and answers a single question: what is the best move here. You can then play on and explore the continuation.
Want more than one move?
Paste a full PGN into the free chess game review to find mistakes and better moves throughout the game. For a position you want to change freely, explore variations on the chess analysis board.