FREE TO USE, NO ACCOUNT
Chess Analysis Board
Load a FEN position or PGN game, explore legal moves and run a small material-search engine on your device. It is not Stockfish and can miss tactics.
Load either FEN or PGN, not both. Inputs are limited to 120 FEN characters or 20,000 PGN characters.
Side to move:
Chessboard
Lightweight material search only; not Stockfish or a win-probability estimate. Search runs locally and may use CPU briefly.
Material score is an educational heuristic. It does not account fully for tactics, positional plans, endgame tablebases, or opening theory.
Analysis result
How to use this board
Load a legal FEN or PGN. Select a piece and destination square to play a legal move. Use Undo to step back. Copy the FEN or PGN to save a position yourself. Analysis is optional and runs only after you press Analyze.
How do I analyze a chess position?
Paste a FEN position or PGN game and load it. Explore legal moves on the board, undo, or choose a search depth and time cap before starting the local analysis worker.
Frequently asked questions
How do I analyze a chess position?
Paste a FEN position or PGN game and load it. Explore legal moves on the board, undo, or choose a search depth and time cap before starting the local analysis worker.
Are my games uploaded?
No. FEN, PGN and moves are handled in this browser. The analysis worker runs locally and is not a cloud engine.
Is this engine as strong as Stockfish?
No. This is a small material-search engine for learning and exploration. It can miss tactics and does not provide grandmaster-strength analysis.
Can I stop an analysis?
Yes. Stop terminates the local worker immediately. Search is also capped by the selected depth and a short time limit.