Free online chess analyzer
Import a game and see what actually changed it. RV Chess compares every move with Stockfish 18 and shows the mistakes, best lines and turning point in plain view.
Review your game now
What this chess analyzer shows
This is a full-game chess analysis tool, not just a board with an engine number. It scores both players, labels every move, plots the evaluation and gives the stronger continuation at the positions that mattered.
- Accuracy and performance rating for both sides.
- Brilliant, best, excellent, good, inaccuracy, mistake and blunder labels.
- A clickable evaluation graph to jump to the moment the game turned.
- Stockfish's preferred move and continuation at every position.
Analyze a Chess.com, Lichess or PGN game
Paste a Chess.com or Lichess game link, paste the PGN from any chess site, or search a Chess.com username for a recent game. The accuracy calculator explains how the percentage is produced rather than treating it as a mysterious score.
Free and private in your browser
Stockfish 18 runs locally in your browser through WebAssembly. There is no account, no daily review limit and no upload of your game positions.