Chess Masti AI is a free AI chess coach that helps you analyze games, ask follow-up questions, and train from your own mistakes. Stockfish evaluates the position, Claude explains it in natural language, and Chess Masti checks chess claims before showing them to you. No subscription. No paywall. Paste a PGN or FEN and your session starts immediately.
The best free AI chess coach is one that does three things: tells you what went wrong, explains why in plain language, and gives you something to practice. Most chess tools stop at the first step.
Chess Masti AI closes the loop. Stockfish handles evaluation accuracy. Claude AI handles the explanation. And your biggest mistakes automatically become puzzles you can drill until the pattern sticks — all free.
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Game analysis
Paste any PGN. Get move-by-move evaluation with natural-language explanations from Claude AI.
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Coach chat
Ask follow-up questions about any position. The coach holds context across your whole game.
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Mistake puzzles
Your worst blunders become drills. Practice the exact positions you keep getting wrong.
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Opponent scouting
See your opponent's opening tendencies, weak squares, and patterns before you play.
Import your game or position
Paste a PGN from Lichess, Chess.com, or anywhere else. Or paste a FEN string to start from a specific position.
Stockfish evaluates every move
The analysis runs in your browser using Stockfish WASM — no data sent to a server for the engine work. Every move gets a centipawn score and classification.
Claude explains what happened
The AI coach reads the Stockfish output and explains each critical moment: what the plan was, where it broke down, and what you should have played instead. Claims are checked before they reach you.
Stockfish can tell you the best move in any position. What it cannot do is explain why the move is best, what theme you missed, or how to avoid the same mistake next time.
A chess engine is a calculator. Chess Masti AI is a calculator with a teacher attached. The engine provides the ground truth; the AI coach translates it into something you can act on. And because the coach reads Stockfish output before explaining it, the explanations stay accurate.
| Tool | Best for | Free? | AI explanations | Training loop |
|---|---|---|---|---|
| Chess Masti AI | Free full-loop coaching | ✓ Fully free | Claude AI | Mistake puzzles + chat |
| DecodeChess | Deep position explanation | Limited free tier | Yes | No |
| Lichess analysis | Engine evaluation | ✓ Free | No | No |
| Noctie | Human-style sparring | Limited free tier | No | No |
Competitor details verified at time of writing. Check each product's site for current pricing.
Chess Masti AI is a strong option for a free AI chess coach. It combines Stockfish engine analysis with Claude AI explanations, converts your blunders into practice puzzles, and lets you ask follow-up questions in plain language — all without a subscription.
Yes. Game analysis, coach chat, mistake-based puzzles, and opponent scouting are all free. There is no subscription, paywall, or credit system.
You import a game PGN or paste a FEN position. Stockfish evaluates each move in your browser. Claude AI reads the evaluation and explains what happened, why the move was a mistake, and what you should have played instead. You can ask follow-up questions and convert your worst mistakes into practice puzzles.
A chess engine like Stockfish tells you the best move and gives a numerical score. Chess Masti AI uses Stockfish for accuracy but then explains the position in natural language — the plan behind the move, the theme you missed, and what to train next. It is the difference between a calculator and a teacher.
Yes. Paste the PGN from any platform — Lichess, Chess.com, or any other source — into the analysis board. You can also paste a FEN string to analyze a specific position.
Yes. Chess Masti AI runs a validation pipeline before showing you analysis. Tactical and positional claims are checked against Stockfish output so the coach does not hallucinate moves or incorrect evaluations.
They serve different needs. DecodeChess is strong at explaining a single position in depth. Chess Masti AI adds a training loop: it turns your mistakes into drills, lets you ask follow-up questions in conversational language, and includes opponent scouting. If you want to close the gap between understanding and improvement, Chess Masti AI is worth trying.
Try the free AI chess coach
Paste a PGN or FEN. No account required to start.