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shinoteki comments on Robust Cooperation in the Prisoner's Dilemma - Less Wrong
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I am bothered by the fact that the reasoning that leads to PrudentBot seems to contradict the reasoning of decision theory. Specifially, the most basic and obvious fact of behavior in these competitive games is: if you can prove that the opponent cooperates if and only if you do, then you should cooperate. But this reasoning gives the wrong answer vs. CooperateBot, for Lobian reasons. Is there an explanation for this gap?
It's true that if you can prove that your opponent will cooperate counterfactual-if you cooperate and defect counterfacual-if you defect, then you should cooperate. But we don't yet have a good formalization of logical counterfactuals, and the reasoning that cooperates with cooperatebot just uses material-if instead of conterfactual-if.
We have Ambient Decision Theory, which is a pretty good formalization of logical counterfactuals.