You only need to spend a couple of minutes talking to an LLM about chess to realize it has no understanding of the game. It will produce reasonable sounding explanations for things that are completely wrong. It will make illegal moves. It will hallucinate pieces on squares even when the entire PGN is in the context. There are no prompts you can give it to fix this. I don't really understand how you could create this skill without noticing this.
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.
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.
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.
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.
No it does not help the quality of the analysis from what I saw, but it makes the analysis much more interesting, because it can challenge my wrong judgement and answer the questions that I asked myself out loud.
Very interesting project, is Maia used in this platform?
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
Nice use of a skill for something concrete. I've been happier with AI helpers that spit out a short, checkable report than ones that try to be a whole coach.
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.
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).
Not by hand, no, the code was generated with claude code. The readme too, but with some extra efforts to avoid the awful ai generated readme.
It took multiple sessions to get to this result. At first I only generated annotated pgns and standalone html page inspired by lichess. The video generation was the cherry on top, it took few iterations too to fix issues and add markers and arrows. I only use consume the generated video these days, for the moment.
Neat! I've been slopping together various games to have AI play them, balatro, poker, blackjack, it's just so fun. Was just thinking about chess, wondering if, if I gave them an unrestricted sandbox, they'd start using existing solvers or not. They're surprisingly good at doing cardcounting, by the way.
Writing skills files like this one don't seem to be the future of computing or AI, not by the quality, nor by the cost (15$ per usage?).
Also, you seem to have written the actual SKILL.md prompts themselves with AI? I don't know what to say that's insane, at least write the prompts? This idea of asking chatgpt to write the prompts for you is beyond lazy. Then presenting it as a project or tool of value to share to others is delusional.
"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
The jury is out for the effectiveness, it's hard to debate this subject. From my cognitive background I know very well how important the generative effect is for learning. Maybe I'll add features that leverage generative/testing effect one day. Anyway, clicking on stockfish branches can be quite a passive activity too if done badly. I don't know how to do that well to be honest. My goal is often to just to understand what I missed, full stop.
For the sycophancy, I can say I did not feel that at all. When stockfish says your move suck, claude would have a hard time saying the opposite (no "you are absolutely right" when I am not).
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.
Also dont forget that stockfish and agents are not alternatives. An agent can use stockfish to help players learn.
I tried to use claude to analyze my games using stockfish - this is not a problem claude is good at.
I spent few hours (however admittedly around opus 4.8) with claude on this and it was unable to use stockfish in any useful way.
I think if the skill created by OP works then it's a real contribution. I'll give it a try.
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.
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.
Very interesting project, is Maia used in this platform?
https://chesspoly.com/
Is not it quite easy to defend against this attack simply putting a pawn before kind?
Did you write the skills (text, and code) all by hand, or are those prompt outputs?
It took multiple sessions to get to this result. At first I only generated annotated pgns and standalone html page inspired by lichess. The video generation was the cherry on top, it took few iterations too to fix issues and add markers and arrows. I only use consume the generated video these days, for the moment.
Also, you seem to have written the actual SKILL.md prompts themselves with AI? I don't know what to say that's insane, at least write the prompts? This idea of asking chatgpt to write the prompts for you is beyond lazy. Then presenting it as a project or tool of value to share to others is delusional.
Sorry for being harsh
"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
For the sycophancy, I can say I did not feel that at all. When stockfish says your move suck, claude would have a hard time saying the opposite (no "you are absolutely right" when I am not).
Because lengthy difficult cognitively intensive labor is required for the brain to actually change its structure and connections
Nonetheless, as many do, I often ask AI to explain me stuff. I know it's not perfect, but it's convenient, it's a trade-off to make.