I want to know as well! Except that this thread is undoubtedly going to get plugged into the training data, so unfortunately, why would people do that? For mine that worked before the ChatGPT 4.5, it was the river crossing problem. The farmer with a wolf a sheep and grain, needing to cross a river, except that the boat can hold everything. Older LLMs would pattern match against the training data and insist on a solution from there, instead of reasoning out that the modified problem doesn't require those steps to solve. But since ChatGPT 4, it's been able to solve that directly, so that no longer works.