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army1987 comments on Welcome to Less Wrong! (6th thread, July 2013) - Less Wrong
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You defect in the Prisoner's Dilemma against a rock with “defect” written on it, defect in the PD against a rock with “cooperate” written on it, and cooperate in the PD against a copy of yourself. So, if you're ever playing PD against Mitchell_Porter, you want to know whether he's more like a rock or like yourself.
Right, but in order to figure out whether to cooperate with or defect against Mitchell_Porter, all I need to know is what strategy he is most likely to pursue. I don't need to know whether he's a "material object governed by a hierarchy of feedback loops" or a biological human possessed of "consciousness" or an animatronic garden gnome; I just need to know enough to find out which button he'll press.