Show HN: A Claude Code skill to analyze your chess games

Claude Code skills allow users to analyze their chess games with a post-mortem that includes plain-language explanations of mistakes, checked against Stockfish, and a narrated video of the entire game. In a personal example, the author played a 15+10 rapid game on Lichess, opening with the Open Sicilian against a Najdorf, and recorded themselves thinking aloud in French.

After the game, they provided Claude with the Lichess link and the audio recording. Claude transcribed the audio locally using whisper.cpp and matched each sentence to the corresponding move based on the clock times in the PGN. The video then displays the transcript, Stockfish analysis, annotated PGN, and storyboard, all within the examples/game-010/ folder.

Claude's analysis provides human-friendly explanations, refuting the user's reasoning when necessary and checking claims against Stockfish. The process takes about an hour for a full run, including sweeping, investigations, annotations, and video creation. The skills are designed for Claude to read, with documentation in SKILL.md files, and can be installed using Claude Code.