How do you prevent degenerate strategies? I could trivially give a model a SHA256 hash and ask it to provide the source input.

In class you'd probably want a rule saying at least one LLM should be able to figure out the answer, but in a head-to-head I'm not sure how to solve it.

Who knows. Maybe Mythos 5 already found a hole in SHA256, so this won't be too hard. :)