> You're strictly correct, but the rules for chess are infamously hard to implement

Come on. Yeah they're not trivial but they've been done numerous times. There's been chess programs for almost as long as there have been computers. Checking legal moves is a _solved problem_.

Detecting valid medical advice is not. The two are not even remotely comparable.

> Detecting valid medical advice is not. The two are not even remotely comparable.

Uh? Where exactly did I signal my support for LLM's giving medical advice?