1. Upload a PGN
Drop a PGN file or paste the notation from Chess.com, Lichess, or your own score sheet.
Free browser analysis
Chess Game Analyzer
Stockfish runs locally in your browser, so your chess game is not uploaded and you do not need to register.
Upload or paste a PGN
Drag a .pgn file here, or paste the moves below.
Board preview
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2. Choose depth
Use the engine controls to balance a quick scan with a deeper review of critical positions.
3. Read the report
Follow the board, evaluation, candidate moves, and move-by-move findings in one place.
What can a chess game analyzer find?
- Opening mistakes before your position is developed
- Middlegame tactical oversights and missed captures
- Endgame conversion errors and missed winning plans
- A score for every move and the evaluation change
- The engine's best move and alternative candidate lines
- Recurring moments worth reviewing after the game
Chess game analyzer, move analyzer, and online analysis
A chess game analyzer reviews a complete PGN. A chess move analyzer focuses on the decision at one position. Chess analysis online can mean either workflow: use the full report for a finished game, or open the board editor to set up a single position. When you want a quick review of a clean PGN, use PGN analysis.
Chess Game Analyzer FAQ
Is this chess game analyzer free?
Yes. Plychess is a free chess game analyzer with no signup, no download, and no daily game limit.
Does Plychess upload my PGN?
No. Stockfish runs locally in your browser through WebAssembly. Your PGN stays on your device during analysis.
What is a chess move analyzer?
A chess move analyzer compares the moves in a game with engine recommendations, then highlights evaluation changes, mistakes, blunders, and stronger alternatives.
Can I analyze my chess game online without an account?
Yes. Paste a PGN or upload a PGN file above and start the review immediately without registering.
What depth should I choose?
Start around depth 16 for a fast review. Increase the depth when you want a slower, more detailed look at a critical position.
Can it find the best chess move from a game?
Yes. The report shows the engine's preferred move and principal variation for each analyzed position.
Does it work on phones?
Yes. The uploader, board, move list, and engine report are responsive and work in current mobile browsers.