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PhilGoetz comments on Prisoner's Dilemma Tournament Results - Less Wrong
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Comments (170)
It looks like malthrin's bot I may have won only because it defected on the last 2 turns. There were enough defect-on-the-last-turn bots for defecting on the last two to be a smart approach, and of the defect-on-the-last-two bots malthrin's was the closest to tit-for-tat.
In the longer evolutionary run, the winning strategy (O) was the one that defected on the last 3 turns. It stuck around until the rest of the population consisted of only defect-on-the-last-two bots (I and C4), and then it took over.
I'd like to see you re-run this competition, adding in a few variants of tit-for-tat which always defect on the last n turns (for n=2,3,4) to see whether I and O are benefiting from their other rules or just from their end-of-game defections.
Or, make each game last longer, so that the last few moves are less important. I agree that which turn you start to defect on appears to have been critical for these rankings.
That would just slow down the differentiation in the evolutionary tournament, since what's important isn't your total score but the ratio of your total score to everyone else's.