Will_Sawin comments on Robust Cooperation in the Prisoner's Dilemma - Less Wrong
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To recognize what?
What you need to recognize is bots that are simulated by other bots. Consider the pair of BabyBear, which does whatever, and MamaBear, which cooperates with you if and only if you cooperate with BabyBear. Estimating the ratio of MamaBears to any particular BabyBear is an empirical question.
What seems problematic about these strategies is that they are not evolutionarily stable. In a world filled with those bots, PsTitTat bots would proliferate and drive them out. That hardly seems optimal!