Stockfish 18 — in your browser
The world's strongest open-source engine runs locally via WebAssembly. No server round-trips, instant results.
All features
Every tool you need
in one place.
Openings, tactics, AI practice, game analysis — free, no account required. Here's exactly what AnkouChess gives you.
Game Analysis Understand every mistake.
Understand every mistake.
Stop repeating them.
Import any PGN and get a full move-by-move breakdown powered by Stockfish 18. Know exactly what went wrong and what you should have played instead.
- Paste PGN from Chess.com, Lichess, or any platform
- Brilliant, good, inaccuracy, mistake, blunder — every move classified
- Best alternative shown at every critical moment
- Visual evaluation bar tracks the advantage throughout the game
- Opening detection with book move indicators
- Accuracy score for white and black
Stockfish 18
Chess Openings 146 openings. Full theory.
146 openings. Full theory.
Interactive board.
Most games are decided in the first 10 moves. A solid opening repertoire gives you a plan from move 1 — and removes a whole category of mistakes from your game.
- 146 openings with complete theory, variations and strategic plans
- Understand why each move is played, not just what to play
- Interactive board — play through every line yourself
- Compare two openings side by side to choose your repertoire
- Search by name, first moves, or ECO code
146 openings
Puzzle Training Train your tactical eye.
Train your tactical eye.
Every single day.
The fastest way to gain Elo isn't memorising theory — it's spotting combinations your opponent misses. 15 minutes of daily puzzles compounds into a completely different player.
- A new puzzle every day — build an unbreakable habit
- Thousands of puzzles from real games at every level
- Community puzzles created by other players
- Instant feedback and best continuation shown after each attempt
- Share daily puzzles with friends
Play vs AI The safest place to test
The safest place to test
everything you've learned.
Ranked games are stressful. Playing against an AI lets you put your openings into practice, experiment freely, and build real confidence — without any pressure.
- 7 difficulty levels — from complete beginner to advanced
- No time pressure — think as long as you need
- Test new openings before your next rated game
- Powered by Stockfish 18 — adjust strength precisely
The confidence loop: Learn an opening → apply vs AI → review the game → dominate with it.
Adjustable difficulty
Position Editor Explore any position.
Explore any position.
Get the best move instantly.
Drag and drop pieces to set up any position. Stockfish 18 calculates the best move for white or black instantly. Perfect for studying book positions or testing your ideas.
- Drag and drop pieces to build any position
- Import positions from FEN notation
- Get the best move for white or black in seconds
- Export positions to FEN for sharing
- Useful for studying endgames, tactics or openings
Puzzle Creator Teaching is the deepest
Teaching is the deepest
form of learning.
Turn a brilliant combination from one of your games into a puzzle. Share it with the community. The act of creating forces you to truly understand the position.
- Build puzzles from any position on the board
- Define the solution move sequence
- Publish and share with the AnkouChess community
- Solve puzzles created by other players
Under the hood
Built to actually work.
No compromises on quality, privacy, or accessibility.
Your games stay on your device
Analysis is computed locally. Nothing is sent to external servers. Your data belongs to you.
Any device, any browser
Fully responsive design. Works on desktop, tablet, and mobile without installation.
100% free — no asterisk
Every feature is free with no limits. No premium tier, no ads, no credit card, no hidden costs.