Chess Next Move Checker

Set up the position here or load FEN or PGN. Calculate legal moves for both sides, then compare the first decision in your line with local Stockfish.

Play both sides of your line

Chess Next Move Checker

Local Stockfish, depth 10 to 22

1Set or load a position

Choose a piece, then tap squares. Use the eraser to remove pieces. Press Use this position before playing legal moves.

Side to move

En passant

Castling rights

White O-OWhite O-O-OBlack O-OBlack O-O-O

2Build and check a line

Your turn

Play a legal move. Add replies for both sides if you want to calculate a line before checking the first decision.

No move yet

Check depth

Depth 12

Fair-play rule: use this after a game or in a study position, never while a live game is running.

Need every FEN clock field? Open the full board editor. Want the evaluation visible throughout? Open the analysis board.

FAQ on Chess Next Move Checker

Position setup, line building, fair play and local processing.

How does the chess move checker work?

Set up or load a position, play your candidate move, and optionally continue a legal line for both sides. Stockfish checks the first decision only when you press Check first move.

Can I move for both White and Black?

Yes. After the first move, keep playing alternating legal replies. The line remains visible, and you can undo its last move before checking.

Can I set up a position without opening another page?

Yes. The Set up tab includes all twelve pieces, an eraser, side to move, castling rights, en passant, clear board, and standard position controls.

Can I use a FEN or PGN?

Yes. Paste a complete FEN or one PGN main line. The checker validates the resulting position before you use it.

What if my move is not Stockfish's first choice?

Compare the top lines. A different move can still be playable, so the result is a prompt for analysis rather than a verdict on your chess.

Can I check more than one decision?

Yes. After a comparison, move the side to move directly on the board or choose Check another move here to begin a fresh decision from the current position.

Can I use this during a live game?

No. Do not use it during a live or rated game. It is intended for post-game review and positions you are studying.

Does the position stay private?

Yes. The tool parses the position and runs Stockfish locally in your browser.

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