See the truth of
every move.
Stockfish-grade analysis that classifies every move and shows you exactly where games are won and lost.
Every move. Explained.
FasAnalysis breaks down your Chess.com games move by move. Engine-powered evaluation classifies every decision — best moves, inaccuracies, mistakes, blunders — so you see exactly where you gained or lost.
Stockfish at depth 18. Win-percentage delta accuracy. No guesswork.
Game Review
Every move classified.
Import any Chess.com game and step through it move by move. Stockfish evaluates every position at depth 18, classifying each decision — Best, Excellent, Good, Inaccuracy, Mistake, Blunder.
Win-percentage delta scoring. Evaluation bar. Move-by-move accuracy breakdown.
Puzzles
Sharpen your instincts.
Curated tactical puzzles from a large open database. Find the winning move, track your rating, and build pattern recognition one puzzle at a time.
Elo-rated via Glicko-2. Adaptive K-factor. Unlimited puzzle stream.
Play
Challenge anyone. Challenge yourself.
Play against Stockfish at any rating from 250 to 3200. Face a friend in local 1v1 with automatic board flip. Or go online and challenge players worldwide.
Engine mode. Local 1v1. Online challenges. Your move.
The Platform
Everything in one place.
Three tools. One focused ecosystem. Built for chess players who want to get better.
Your move.
Every game has a story. Let the engine tell yours.
Free. No signup required.