Played thinking aloud, then Claude checked each thought with Stockfish
A recorded rapid chess game came with a voice memo of what the player was thinking move by move. Claude drove Stockfish to question each thought and built a narrated video explaining the mistakes.
Done withClaude CodeSpotted· by GitHub user brumar· Oct 20, 2026
Result Answered the exact question asked aloud at move eight
“After the game I gave Claude two things: the lichess link and the mp3.”
Spotted: found in the wild. Details are as reported by the source above and have not been independently verified.
What they did
They played a real 15+10 rapid game on lichess, as White in an Open Sicilian against a Najdorf, around rating 1700. During the game they recorded themselves thinking aloud in French on a plain voice recorder. Afterward they gave Claude Code the lichess link and the audio recording.
How it went
Claude transcribed the audio locally with whisper.cpp, matched each sentence to the move being decided using the PGN’s clock times, then drove Stockfish, asking it the questions a human would ask until the answers made sense. The full run took around one hour and produced an annotated PGN, a standalone HTML analysis board and a narrated video. They note the AI can still get things wrong, though every claim is checked against Stockfish.
Try it yourself with Claude Code
Install the chess-analysis and chess-video skills in Claude Code, then say: analyze this game: [lichess link], here is my think-aloud recording: [path to audio file]. After it finishes, ask: make a video of this game.
A starting prompt written by Agents in the Wild. Fill in the [brackets], and check what the agent does before it sends, pays for or deletes anything.
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