Giles comments on Decision Theories: A Less Wrong Primer - Less Wrong
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Yes, but it would be strictly better (for me) to be the kind of agent who defects against near-copies of myself when they co-operate in one-shot games. It would be better to be the kind of agent who is predicted to one-box, but then two-box once the money has been put in the opaque box.
But the point is really that I don't see it as the job of an alternative decision theory to get "the right" answers to these sorts of questions.
The larger point makes sense. Those two things you prefer are impossible according to the rules, though.
They're not necessarily impossible. If you have genuine reason to believe you can outsmart Omega, or that you can outsmart the near-copy of yourself in PD, then you should two-box or defect.
But if the only information you have is that you're playing against a near-copy of yourself in PD, then cooperating is probably the smart thing to do. I understand this kind of thing is still being figured out.