Chess Solver
Find the best move in any chess position instantly. Our free solver uses Stockfish 18 — the world's strongest chess engine — to analyze millions of positions per second and show you exactly what to play.
How It Works
Stockfish 18 runs directly in your browser via WebAssembly. No downloads, no server calls — the engine executes entirely on your device for instant analysis. Set up any position and get the strongest continuation in seconds.
Paste FEN
Copy a FEN string from any chess platform and paste it to load any position.
Load PGN
Import a complete game in PGN format and analyze every move.
Scan Screenshot
Upload a chess board image — Screenshot Scanner detects pieces automatically (Premium).
AI Coach
Get explanations of why each move is best — tactics, strategy, and principles.
Why Use This Tool?
- Powered by Stockfish 18 — rated over 3500 ELO, stronger than any human player
- AI Coach explains why moves are best, not just what to play
- Runs in your browser — no download, no installation, works on any device
- Supports FEN, PGN, drag-and-drop, and screenshot scanning
- Free tier with 5 daily AI insights, Premium unlocks unlimited analysis up to 3650 ELO
Free — no signup required
Frequently Asked Questions
What is this tool and what does it do?
It analyzes any chess position and finds the strongest continuation. Powered by Stockfish 18, the world's strongest open-source engine (3500+ ELO), it evaluates millions of positions per second to show you exactly what to play.
How do I set up a position?
Open the Calculator on the homepage. You can drag pieces on the board, paste a FEN string, import a PGN game, or upload a screenshot. Click Hint to see the engine's recommended move with an evaluation score.
Is it free to use?
Yes — the free tier includes analysis up to 800 ELO depth and 5 AI insights per day. Premium unlocks 3650 ELO depth, unlimited insights, Human Mode (No Ban), Smart Tactics, and Screenshot Scanner.
Can I analyze a position from a photo?
Yes. The Screenshot Scanner (Premium) uses computer vision to detect pieces from any board image. Upload a screenshot and the position loads automatically for analysis.
How accurate is the analysis?
It uses Stockfish 18 with NNUE neural network evaluation — the same engine grandmasters use for tournament preparation. It's the most accurate analysis available anywhere.
What is FEN notation?
FEN (Forsyth-Edwards Notation) describes a position in a single line of text. Copy it from any chess platform and paste it here to load that exact position instantly.