Can Claude analyze chess games?

Yes, Claude can analyze chess games, but on its own it only does half the job. It can read a game you paste in PGN (the standard text format for chess games), name the opening and talk about the plans in plain words. What it can't do alone is check its claims: it has no chess engine, so its evaluations are educated guesses and it can misread the position. Connect it to an engine and that changes. With Chess Coach, Stockfish analyzes your Chess.com or Lichess game, and Claude explains what the engine found.

What Claude does well in chess analysis

Language is Claude's strength, and a lot of chess learning is language. Using Claude for chess works best for:

• Explaining ideas. A pin, for example, is when a piece can't move without exposing a more valuable piece behind it. Claude can explain that, show where it happened, and adjust to your level.
• Answering "why" questions. Why is this pawn weak? Why trade queens here? You can keep asking until it clicks.
• Summarizing. Which phase of the game went wrong, what the opening was trying to do, what to study next.
• Teaching. Can Claude teach chess? For rules, principles and common patterns, yes. It is patient and available at any hour.

Can Claude analyze chess games without an engine?

Not reliably. The trouble starts with concrete positions. Look at this one, three moves into a game. White's queen and bishop both aim at the pawn next to Black's king.

r . b q k b n r
p p p p . p p p
. . n . . . . .
. . . . p . . Q
. . B . P . . .
. . . . . . . .
P P P P . P P P
R N B . K . N R

Moving the knight out (Nf6) looks like a textbook move. It develops a piece, and it creates a double attack: it threatens the queen and the pawn on e4 at the same time. Described in words, it sounds great. Stockfish sees in an instant that it loses: the queen takes the pawn on f7 with the bishop's support, and that's checkmate. The engine's choice is the pawn move to g6, which attacks the queen and blocks its path, and the game stays about equal.

That's the gap. A description can make a losing move sound good. Only checking every reply shows the mate. Without an engine, Claude has to do that checking in its head, and the public tests show where that breaks down:

• Blunders. Even the strongest Claude model in Dubesor's AI Chess Leaderboard, Claude Opus 5.5, blundered on 2.8% of its moves (data of October 21, 2026). If it misses these in its own games, it can miss them in yours.
• Illegal moves. On the open LLM Chess Benchmark, checked on October 22, 2026, only 80.1% of Claude Haiku 4.5's moves were legal on the first try when it played without thinking. A suggested "better move" that isn't even possible is worse than no suggestion.
• Made-up numbers. If Claude writes "+1.5" without an engine, that number didn't come from a search of the position. It is a guess written in an engine's format.

We look at the playing side in Can Claude play chess? and the ratings in Claude chess Elo. The same limits apply to other chatbots; see Can ChatGPT analyze chess games?

How to analyze a finished Lichess game with Claude

Start with a public Lichess game that has ended. Use the sample prompts below, replacing the bracketed text with your own link or username. You can use the same steps for a finished Chess.com game.

1. Connect Chess Coach. Follow the Claude setup instructions and sign in to Chess Coach. Custom connector access depends on your Claude plan and workspace permissions. Anthropic's custom connector guide explains that access (checked October 23, 2026). You never need to give Chess Coach your Lichess password.
2. Choose the finished game. Paste its Lichess link and ask: "Review this finished Lichess game: [game link]. Explain it for a beginner." If you don't have the link, ask: "Show my latest finished Lichess games. My username is [username]. Let me choose one to review." Check the opponent, date and colour so you are looking at the right game. You can also supply its PGN.
3. Choose one turning point. On the interactive board, open a numbered key moment and step back to the position before your move. Compare the move played with the engine's better move. Rather than trying to learn every mistake at once, start with the one you don't understand.
4. Ask for the reason. Try: "What was I overlooking before this move? Show the opponent's strongest reply from the Stockfish analysis." Then: "Why does the suggested move address that problem? Explain the difference without a long line of notation." Ask to see the position on a board if words alone aren't enough.
5. Test your own alternative. Return to that position and move a piece on the board to try your idea. Ask: "Analyze this alternative with Stockfish. What is the opponent's strongest reply, and how does it compare with the engine's original choice?" Keep the comparison tied to that exact position. Ask for a fresh position check if your line goes beyond the reviewed continuation.
6. Keep one lesson. Ask: "What should I check before making a similar move next time?" Restate the idea in your own words, then use Practice mistakes to revisit the position without looking at the answer first.

The review and position checks provide the engine findings; Claude turns them into a conversation. Treat the explanation as something you can question: if a claimed threat isn't clear, ask for the checked continuation. The board's "Why?" buttons are another way to ask about the position on screen. For more question ideas, see prompts for a chess coach; the post-game questions also work in Claude. The board documentation explains the controls.

Lichess already analyzes games for free: what Claude adds

Lichess has its own analysis, and it is free. As of November 2, 2026, its features page says all features are free for everybody, and lists deep Stockfish 19 server analysis for 40 games a day, an unlimited analysis board and an unlimited "Learn from your mistakes" mode, which turns the errors of an analyzed game into find-the-move exercises. If you want evaluations and marked mistakes for one Lichess game, that is enough, and it costs nothing.

What Claude adds is the conversation. Lichess shows you that a move was a mistake and which move the engine preferred. With Chess Coach, Claude explains why in plain words, answers follow-up questions about that position, and can check an alternative you suggest. It also works the same way for Chess.com games, so you can review both accounts in one place. We compare the two sites' own reviews in Lichess game review vs Chess.com, and the Lichess analysis board guide covers the free tools.

There are three ways to bring a Lichess game to Claude:

The username route uses the list_games tool, which can also search by month, opponent, result, colour, time control or opening. Nothing is reviewed until you pick a game.

An example position: testing your own idea

We don't have a real Lichess game to show here: the founder's reviewed games are on Chess.com. The position below comes from one of them, Manueld8 (1287) vs nacsol3 (1291), March 20, 2025. The steps for testing an idea are the same on a Lichess game.

r . . . k . . r
p p p . . p b p
. . . p . q p .
. . . . n . . .
. . . . . . . .
. . N . P . P .
P P P Q B P P .
. . K R . . . R

Taking the pawn looks attractive: the queen attacks White's bishop and two pawns at once. A position check with Stockfish shows White's answer. The bishop moves away with check, and that uncovers White's queen, which now attacks Black's queen. This is a discovered attack: one piece moves and reveals an attack by the piece behind it. Black has to deal with the check first, and the queen is lost. In the game, White took it two moves later. Before the capture the position was about equal; after it, White is winning.

The engine's choice, the knight stepping back, opens the queen's line toward White's knight, and the game stays about equal. In a fresh position check, castling was also about equal. This is the kind of comparison step 5 above is for: ask Claude to analyze the move you were considering, read the opponent's strongest reply, and keep the lesson in one sentence. Here: before grabbing a pawn with your queen, check whether an enemy piece can move with check and uncover an attack on it.

Is Claude a good chess coach?

With an engine behind it, Claude makes a patient explainer for your finished games. Chess Coach explains at a beginner level by default and can switch to intermediate or advanced. It reviews games after they're over and never helps during a game in progress. The founder's own 2,116 rapid games were reviewed with the same engine, and you can read what he learned.

Every account starts with 14 days of full access, no card needed. After that, the free plan includes one in-depth review per day, the board, mistake practice, opening reports and 30 position checks a day. Plus ($3.99/month) adds 10 reviews a day, a five-area player profile and drills from your own mistakes. Pro ($7.99/month) is unlimited with fair use. Learn more about the AI chess coach and AI chess analysis, or connect Chess Coach to Claude.