> In my view, intelligence includes an ability to learn and adapt to never-before-seen situations.

This is exactly what ARC AGI tests

> And then general intelligence is an ability to apply that across a wide variety of domains.

My experience with Fable is that it can certainly apply that in a wide variety of domains

> However, last I checked, a seemingly very intelligent LLM still struggles to play Chess at a basic level

People also struggle to play Chess at a basic level. They only succeed by studying the game for a long time. I will concede that humans can do this and LLMs generally cannot.