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

https://github.com/brumar/chess-postmortem-skills
16•brumar•1h ago
Hello HN,

It started as an experiment: can Claude play chess properly if it uses vision instead of PGN notation? Somehow it can.

The next experiment was to see whether Claude + Stockfish could explain a game. Somehow it can too.

A few sessions later, I had a system that takes my live audio notes (or text, for that matter) and a vague instruction like "analyze my last lichess game", and gives me a commented video of the game. The result is not perfect and it takes time to deliver (an hour or so), but for me it is a much more pleasant and memorable experience than clicking around Stockfish branches. It burns tokens, so make sure you have enough quota. From the session logs, the last analyzed game would have cost around $15 at API prices.

The fact that it reflects on my own thinking during the game makes it interesting from a teaching point of view, so I thought it was worth sharing.

Comments

IMTDb•35m ago
I am very interested in this, but it looks like the video link gives 404
brumar•30m ago
Weird, the video is supposed to be embedded. On my chrome desktop it displays properly. EDIT: fixed
Madmallard•17m ago
"The result is not perfect" as LLMs are

"The fact that it reflects on my own thinking during the game makes it interesting from a teaching point of view, so I thought it was worth sharing." As AI the premium sycophantic scammer does

"but for me it is a much more pleasant and memorable experience than clicking around Stockfish branches"

And SO much less effective than doing the harder, more tedious feeling work

WoodenChair•16m ago
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.
brumar•2m ago
This what I think too. I also think there are much more refined approaches than the one I tried here. From a cursory look, I saw there are both scientific litterature on the subject of mixing llms and tools like stockfish and some dedicated closed platforms that put that into action.

Let's make clear that I did not spend much time on this project. Ideally I would have tried to put other models into the mix, like maybe Maia to better see the game from a "real player" eyes and pinpoint where expected move and stockfish moves differ.

Anyway, to me, it's good enough to be usable and shared.

qwend•16m ago
How does it work? Does it just use stockfish under the hood? I just remember the times when I tried to use an AI model to play chess and half of the time it either hung a piece or made an illegal move.
qwend•13m ago
Was a bit to overzealous... Just read the readme. Looks pretty cool. Maybe I'll give it a try and see how it compares to the chess.com analysis (although I have to say that I never really use it).
porridgeraisin•14m ago
The elo of opus 5 models is 1300 or so. I wouldn't take chess lessons from a 1300.
brumar•9m ago
That was exactly my estimation when I played "raw" against Opus. But Opus with stockfish as a tool and much time available can, from what I experienced, generate good comments.
kokoe•1m ago
You could also download my free chess app that hooks up to Claude for real time game analysis or chat about the game. https://pwalessi.itch.io/chess-buddy

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