I could change the rules and decide not to stand for such tricks (mixed strategies) either. EDIT: No, I couldn't.
And on the other hand, Omega could deal with mixed strategies perfectly well, and I don't really understand why people make it so that he explicitly doesn't tolerate mixed strategies in their problems. For example, in Newcomb's Problem, if you one-box with probability p, Omega can just fill box B with probability p - for example if p=0.5 your expected winnings in Newcomb's Problem are $500,500.
In the traditional formulation of Newcomb's Problem (at least here on Less Wrong), if Omega predicts you'll use a randomizer, it will leave box B empty.
This is equivalent to Newcomb's Problem in the sense that any strategy does equally well on both, where by "strategy" I mean a mapping from info to (probability distributions over) actions.
I suspect that any problem with Omega can be transformed into an equivalent problem with amnesia instead of Omega.
Does CDT return the winning answer in such transformed problems?
Discuss.