nerzhin comments on Prisoner's Dilemma Tournament Results - Less Wrong
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Having a known number of rounds seems like a problem to me. Everybody wants to defect on the last round. It might be interesting to retry with a number of rounds chosen randomly from 100 to 110 or where after 100 each round has a 25% chance of being the final round. However a large number of matches might be needed to offset the advantages of playing in some matches with a higher than average number of rounds.
Or just prohibit the bots from knowing which round they are playing.
If they are allowed to know the history of the bot they are playing against (that is, what it has done to them) then they have to know how many rounds they've played.
Sure, but you could have a limit on how many rounds back they remember, or you could fill in the history with some rule.