DiamChess – Free Game Review & Stockfish Analysis for Chess.com

Free, unlimited game review for Chess.com: Stockfish 19 finds your brilliant moves, blunders, accuracy and builds a training plan.

Review every Chess.com game for free, no limits, no subscription. DiamChess runs Stockfish 19, the strongest chess engine in the world, directly in your browser and classifies every move like a premium game review: ‼ Brilliant · ! Great · ★ Best · Excellent · Good · Book · ?! Inaccuracy · ? Mistake · ✕ Miss · ?? Blunder 🆕 NEW IN VERSION 1.5 • DiamPuzzle: unlimited puzzles at your level, with their own rating that starts from your Chess.com puzzle rating • Train on your blunders: click on a mistake and play a series of puzzles on the same theme • Variation analysis: play your own moves on the board and see them evaluated and classified live • Visual explanations: every move is explained right on the board (arrows, squares, hanging pieces) • Coach adapted to your level: comments and standards adjust to your rating • More reliable statistics, and you can now delete a single analysis from the cache ♟ INSTANT GAME REVIEW • Starts automatically as soon as a game ends • Accuracy, estimated performance rating and evaluation graph • Best-move arrows, refutation of your mistakes, key moments timeline • A built-in coach explains every move in plain words • Your opponent's mistakes are shown as chances you missed or took 📊 ADVANCED PLAYER STATS Open any Chess.com profile and click “Advanced stats” to analyze up to 100 games: • Your player profile and 8 skills rated out of 100 • Where you really lose points: hanging pieces, forks, missed mates, time trouble, endgames… • Your top priorities with concrete advice, a move checklist and a 7-day training plan • Openings, best time of day to play, tilt after losses, rating history and more ✨ BEAUTIFUL & FAST • Smooth animations and sounds for brilliant moves and blunders • Multi-threaded engine, auto-tuned to your computer (Fast → Extreme) • Full transparency: see the exact depth and settings Stockfish uses • 5 color themes; every effect can be turned on or off 🔒 PRIVATE & FAIR • Everything runs locally on your computer — no account, no data collected • Fair play first: analysis only works on finished games, never during a live game 🌍 Available in English, Français, Español, Deutsch, Italiano and Português DiamChess is an independent project and is not affiliated with or endorsed by Chess.com.