Free Chess Game Analyzer with Stockfish 18
Analyze any chess game with the world's strongest engine. Import from Chess.com or Lichess, classify every move from Brilliant to Blunder, and get instant accuracy scores — free, no sign-up required.
Frequently asked questions
Is MoveSense free?
Yes. Import games from Chess.com or Lichess by username, or upload a PGN file — Stockfish 18 Lite analysis is free with no limits. Premium unlocks a server-side engine with greater depth and extra features.
How do I load my games?
Enter your Lichess and/or Chess.com username in profile settings and games load automatically. You can also paste or upload a PGN file, including multi-game PGN files.
How is accuracy calculated?
Using the same formula as Lichess: centipawn loss per move is converted into win probability and averaged across the whole game. The result is a percentage showing how close your moves are to Stockfish's best options.
What does the Statistics screen show?
Rating, win rate, favorite openings, recent form. Plus behavioral patterns: stability score, tilt after losses, opening repertoire diversity, and time pressure losses — all derived from your real game history.
Can I play chess here?
Yes. Play against a Stockfish bot with adjustable difficulty right in the browser, or connect your Lichess account and play online against real opponents — all without leaving MoveSense.
What is the AI Coach?
The AI Coach is a personal assistant powered by Claude that reviews your games in plain language. It explains mistakes, gives opening advice, and tells you what to work on — like a real trainer, but always available.