Zvi comments on Prisoner's Dilemma Tournament Results - Less Wrong
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I think it's unfair to call my strategy (N) Not Nice. There were 15 strategies that would cooperate with a cooperation rock. I just didn't expect anyone to enter permanent revenge mode after so much as a single defection. If there hadn't been any such strategies, or if they had been outnumbered by cooperation rocks, or if there had been enough other testing bots to quickly drive them to extinction I think I would have won the evolutionary tournament.
In my experience, sending out a probe is riskier than it looks, and the only reason to do so is if you have strong reason to believe a pure-C player is in the field.