Free tool · no sign-in required

Free chess game analysis online

Paste the PGN of your game from Chess.com or Lichess.org. Game Review uses Stockfish to analyze the moves and reveal the moments where a better decision mattered. Complete game analysis is free, with no sign-in required.

Analyze a game — paste PGN →

From your game to practice

Game → analysis → key moments → retry a move → group training. Select several moments from your chess game review and practice them together, then return to the same game to continue your analysis.

Understand the mistake behind the score

This chess game analyzer connects a move on the board to Stockfish lines and the evaluation graph. Explore your own idea, compare replies, then play the critical decision again.

PGN, FEN and Stockfish in your browser

PGN analysis covers the complete game. You can also load a FEN or place pieces in the editor to investigate a single position. Stockfish 19 runs locally through WebAssembly; analysis time depends on your device and settings.

How game analysis works

  1. Paste or import the PGN of a complete game.
  2. Move Forge analyzes each move with Stockfish and shows the real progress.
  3. Review accuracy, mistakes and key moments from your chosen player’s perspective.
  4. Retry a mistaken move without leaving the board.

What Move Forge shows

  • Accuracy and move classifications
  • Book moves and key moments
  • Engine lines and the evaluation graph
  • Your opening repertoire in this game, after signing in
  • A game library for the current position, when data is available
  • Comparison with your own games, after signing in
  • A chance to replay a critical decision on the board

Free analysis without an account

Full Game Review, accuracy, key moments and local retries are available without payment or sign-in. An account lets you use your own repertoire and game history. Library coverage depends on the selected position.

Game analysis questions

Is chess game analysis free?

Yes. Paste a PGN and complete a full Game Review without payment or an account.

How do I import a PGN?

Choose “Analyze a game”, paste the full PGN into the import dialog and start the analysis. Keep the PGN headers so the review can identify the result and time control.

Does Move Forge use Stockfish?

Yes. Stockfish game analysis runs in your browser. Engine lines and evaluations help explain positions, alongside your own ideas and plans.

Can I analyze games from Chess.com and Lichess.org?

Yes. Download or copy your game’s PGN from Chess.com or Lichess.org and paste it into Board Lab. Signed-in players can also open games from their Move Forge history.

Can I retry a mistaken move?

Yes. Choose the retry action at a key moment. You make the decision on the same board and return to the game review when the attempt ends.