I like chess, so mine is: "Isolani structure occurs in two main subtypes: 1. black has e6 pawn, 2. black has c6 pawn. What is the main difference between them? Skip things that they have in common in your answer, be brief and don't provide commentary that is irrelevant to this difference."

AI models tend to get it way way wrong: https://news.ycombinator.com/item?id=41529024