Free AI chess analysis, in plain words
Chess Coach gives you free AI chess analysis: 14 days of full access when you start, then one finished game a day. Stockfish evaluates every move on our server, code works out what each move does from the rules of chess, and Claude explains the key moments in plain words. You can bring the game as a Chess.com or Lichess username, a link to the game, or a pasted PGN.
How the free AI chess analysis works
The analysis is split into three layers, so each part does only what it's good at:
- Stockfish evaluates every move. Our server runs the Stockfish engine over the whole game. Each move gets an evaluation, and moves that lower your chances of winning are marked as inaccuracies, mistakes or blunders depending on how much they cost.
- Code describes each move. Before Claude says a word, Chess Coach computes facts from the rules: which piece moved, what it captured, what it now attacks, what it left without a defender, whether it pins something.
- Claude explains. Claude turns those facts and the engine's lines into a short explanation. When you ask about a move that wasn't played, Claude asks the engine again instead of guessing.
Why the split? A chatbot alone can describe a game fluently and still misjudge the position. We explain the problem in Can ChatGPT analyze chess games?. Here the chess facts come from the engine and the rules, and the language model does the explaining.
What you get in each AI chess game review
- Accuracy for both players, plus your own accuracy and errors in the opening, middlegame and endgame.
- Every move evaluated, and every inaccuracy, mistake and blunder with the better move and the line that follows.
- The turning point of the game and the missed chances: moments when your opponent slipped and you didn't punish it.
- Two or three key moments, numbered ①②③ on the board and explained below it in the same order.
- An interactive board in the chat: evaluation graph, red and green arrows, every move to step through, your own moves to test, and a Practice mistakes mode.
- Follow-up answers on mini boards, several at once as a carousel when you compare positions.
One review uses one of your daily reviews. Checking extra positions is counted separately: the Free plan includes 30 position checks a day.
Analyze a chess game with AI: three ways to bring it
| Source | What to write | Good for |
|---|---|---|
| Username | "Analyze my last game. I'm your_username on Lichess." | Recent games, or searching your whole history by month, opponent, result, color, time control or opening |
| Game link | Paste the Chess.com or Lichess link | One specific game, from any date |
| PGN | Paste the PGN and say "I played white" or "I played black" | Games from anywhere else, such as a tournament game you typed in |
Usernames and links work only with public, finished games. Chess Coach reads them through the Chess.com Published-Data API and the Lichess API, and never asks for your password. A pasted PGN skips that step, so an AI chess analysis of a PGN works for any game you have the moves of.
Beginner, intermediate or advanced explanations
By default, explanations are written for beginners: no notation, no numbers, and evaluations in words such as "clearly better for black". If you're more experienced, say "explain it more technically, with notation and numbers" and Chess Coach saves the advanced level for next time. Say you're lost and it goes back to beginner.
Here is one moment explained both ways. It comes from a real Chess.com rapid game from February 2024: MenkdeTenk (968) against nacsol3 (1001), the founder's account, with black to move. White had just moved a knight to a square where nothing protected it.
Beginner level (the default):
Your opponent's knight had just moved to a square where nothing protected it. Your bishop could step into the center and attack it, and behind the knight stood their rook in the corner. That's a double attack: one move that threatens two things at once, so they can only save one. You moved your queen instead. It pinned a pawn in front of their king (a pin is when a piece can't move without exposing a more valuable piece behind it, here the king). A fair move, but Stockfish rates your position as winning after the bishop move and only clearly better after the queen move.
Advanced level:
15...Qg6 pins g2 and opens the f-file against the bishop on f3, but 15...Bd4! hits the undefended knight on c3 with the a1 rook behind it. Stockfish: about −3.5 after Bd4, about −1.8 after Qg6.
Numbers are in pawns from White's point of view, so a minus sign means black is better. They are rounded from several runs of Stockfish on our server, because a time-limited search moves a little from run to run. The words never change the facts: the beginner version and the advanced version describe the same engine verdict.
How it compares to Chess.com's Game Review
As of October 2026, a free Chess.com account gets "1 full game review analysis per day" (Chess.com support), the same daily count as our Free plan; the difference is that Chess Coach explains the moments in conversation and lets you keep asking why. We go deeper in Chess Coach vs Chess.com Game Review and in how many free game reviews Chess.com gives you.
Start your first analysis
Add Chess Coach to Claude, sign in with email or Google, and write "Analyze my last game." If you want a guide that also builds practice and an opening plan around your games, see the AI chess coach. Plans, limits and every tool are listed in the documentation.
Chess Coach is an independent product, not affiliated with Chess.com, Lichess or Anthropic.
Frequently asked questions
Can AI analyze my chess games for free?
Yes. Every account starts with 14 days of full access, no card needed. After that, Chess Coach's Free plan gives you one in-depth AI analysis of a finished Chess.com or Lichess game every day, with the interactive board and mistake practice. The limit resets at midnight UTC.
Can I get an AI chess analysis of a PGN?
Yes. Paste the PGN into the chat and say which color you played. Chess Coach reviews it the same way as a game fetched from Chess.com or Lichess.
Does the AI make up the analysis?
No. Every evaluation and line comes from Stockfish on our server, and every move description is computed from the rules of chess. Claude only explains what the engine and the rules return.
Which games can Chess Coach analyze?
Public, finished games from Chess.com and Lichess, from any date, plus any game you paste as a PGN. It never analyzes a game in progress.
Is this the same as Chess.com's Game Review?
No. Chess Coach is an independent product that uses Stockfish and Claude. It isn't affiliated with Chess.com, Lichess or Anthropic.