Engines are flawless, humans play FlawChess
Import games from chess.com and lichess. Explore openings move by move, track endgame performance, and find exactly where you win and lose.
🏗️ Under active development. Bug reports and feature requests are welcome on GitHub or via support@flawchess.com.
Sign up freeFree to useOpen sourceMobile appOpening explorerProgress trackingEndgame statsCross-platform
Interactive Opening Explorer
- Step through any opening and see your win/draw/loss rate for every move you’ve played.
- Discover which moves you struggle against and which traps and gambits work for you.
- Scout your opponents’ weaknesses and tendencies before a match.
Opening Comparison and Tracking
- Bookmark your favorite openings and compare their performance.
- Find out how your opening study impacts your win rate over time.
- Use the filters to see which openings work best for which time controls.
System Opening Filter
- You play the London, but your analysis tool scatters your games across 5 different opening names.
- FlawChess lets you filter by your pieces only, ignoring your opponent’s responses.
- Calculate win/draw/loss rates for your system openings across all variations.
Endgame Statistics
- Measure your endgame performance, conversion, and recovery ability.
- Track your win/draw/loss rates by endgame type: rook, minor piece, pawn, queen, and more.
- Find out for each endgame type how often you convert material advantages and recover from deficits.
Cross-Platform Import
- Import games from chess.com and lichess into one place.
- Add your most recent games with the sync button.
- Import your opponent's games to prepare for an upcoming match.
Frequently asked questions
Acknowledgements
FlawChess is built with and inspired by these projects:
- Lichess — open-source chess platform and game data API
- Chess.com — chess platform and game data API
- OpeningTree.com — inspiration for position-based opening analysis
- python-chess — chess logic, move generation, and Zobrist hashing
- FastAPI — async Python web framework
- chess.js — chess move validation and game state
- react-chessboard — interactive chessboard component
- Recharts — composable chart library
Free to use. No credit card required.
Sign up free