Drag a piece onto the board, or select a piece then click a square to place it. Right-click a square to erase.
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Best line
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Valid position
Side to move
Castling rights
Replay and analyze chess games in your browser
Replay Chess is a PGN viewer and analysis board. Paste a game, step through it move by move and let Stockfish evaluate every position. No sign-up, no server: the engine runs locally on your device.
How it works
Paste PGN text, open a .pgn file or load the sample game.
Step through the moves, jump to any move or flip the board.
Stockfish shows the evaluation, the best move and the best line for each position.
Features
Move quality labels from Brilliant to Blunder, based on the engine evaluation before and after each move.
Best line preview: click a move in the engine line to see the position.
Board editor: set up any position, check that it is legal and analyze it.
Save games in your browser and export them as PGN.
Adjustable engine depth, evaluation bar and best-move arrow.
Privacy and limits
Analysis uses Stockfish 19 Lite (single-threaded WebAssembly) in a Web Worker; your games never leave the browser.
Move labels are an estimate from a single engine line and can differ from other chess sites.