Chess Postmortem Skills - Claude Code analysis for your chess games
Show HN: A Claude Code skill to analyze your chess games
Chess Postmortem Skills is a set of Claude Code skills that turn your chess games into readable post-mortems. It runs a Stockfish sweep, then uses AI investigators to ask the engine human-like questions until every mistake is explained. You get a plain-language annotated PGN, a standalone HTML analysis board, and even a narrated video of the whole game. The magic happens when you provide your own think-aloud recording or notes: Claude transcribes and aligns them to your moves, so the analysis refutes your actual reasoning. Ideal for slow or rapid games where you want to learn, not just see where the eval bar dropped.
With your thoughts, you get a review of your reasoning: which fears were justified, which plans were sound, which questions you asked yourself and what the answer was.
- Bootvis
Already a year ago I vibe coded Babelfish: https://github.com/bobjansen/Babelfish
It integrates an LLM of your choice with StockFish to analyze games. Back then, the results weren't very good and I abandoned the project but a lot has changed (the LLM's got better and I did too) so maybe it is time to take another stab at it.
- brausepulver
Does this give sensible analysis if you don't record your thinking out loud?
I've been using Elogram (https://elogram.gg/, made by a friend), which gives interpretability by showing how difficulty of a position changes with elo.
- dverlaeckt80
As a chess player I feel this is fascinating although there are plenty of analysis options already on lichess on chess.com. Still, sometimes it is more about learning and curiosity. Well done.
- WoodenChair
Just a note that this is not novel. Automatic analysis of chess games built on traditional engines has existed for a long time. Without using stockfish as a sidekick, this wouldn’t be interesting because of the poor play of LLMs, however having an LLM enhance the commentary is interesting and I suspect has already been done by chess.com for years.
- kokoe
You could also download my free chess app that hooks up to Claude for real time game analysis or chat about the game.