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Vladimir_Nesov comments on Towards a New Decision Theory - Less Wrong
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The problem is that the two human player's minds aren't logically related. Each human player in this game wants his AI to play defect, because their decisions are logically independent of each other's. If TDT doesn't allow a player's AI to play defect, then the player would choose some other DT that does, or add an exception to the decision algorithm to force the AI to play defect.
I explained here why humans should play defect in one-shot PD.
If you already know something about the other player, if you know it exists, there is already some logical dependence between you two. How to leverage this minuscule amount of dependence is another question, but there seems to be no conceptual distinction between this scenario and where the players know each other very well.