Open-Source Tool Lets Claude Code Turn Chess Games Into Stockfish-Verified Post-Mortems

A developer has released an open-source tool that combines Claude Code with the Stockfish chess engine to automatically produce detailed "post-mortems" of chess games, aiming to make engine analysis more accessible to everyday players.

The project, called chess-postmortem-skills and published on GitHub under the username brumar, packages a set of Claude Code skills that take a single chess game and generate a plain-language breakdown of its key moments. The output includes an annotated PGN file cross-checked against Stockfish evaluations, an HTML viewer for browsing the analysis move by move, and a narrated video that walks through the entire game.

The goal, according to the creator, is to translate raw engine output — the numerical evaluations and best-move suggestions that chess engines typically provide — into explanations a human player can actually understand and learn from, rather than leaving users to decode centipawn scores on their own.

The release was shared on Hacker News under the title "Show HN: A Claude Code skill to analyze your chess games" and quickly reached the site's front page, drawing a round of discussion from the community. The creator noted, with some self-deprecating humor, that they wished they had picked a demonstration game without one of their own major blunders in it.

Details of the tool's inner workings, including exactly how it integrates Stockfish's analysis with Claude Code's language capabilities, were limited in the material made available. Readers interested in technical specifics or the full community discussion can find the original Hacker News thread and the project's GitHub repository for further reading.