[tmnvdb]

If you train an LLM on chess, it will learn that too. You don't need to explain the rules, just feed it chess games, and it will stop making illegal moves at some point. It is a clear example of an inferred world model from training.

https://arxiv.org/abs/2501.17186

PS "Major commercial American LLM" is not very meaningful, you could be using GPT4o with that description.