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shokwave comments on Prisoner's Dilemma Tournament Results - Less Wrong
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Variants I'd like to see:
1) You can observe rounds played by other bots.
2) You can partially observe rounds played by other bots.
3) (The really interesting one.) You get a copy of the other bot's source code and are allowed to analyze it. All bots have 10,000 instructions per turn, and if you run out of time the round is negated (both players score 0 points). There is a standard function for spending X instructions evaluating a piece of quoted code, and if the evaled code tries to eval code, it asks the outer eval-ing function whether it should simulate faithfully or return a particular value. (This enables you to say, "Simulate my opponent, and if it tries to simulate me, see what it will do if it simulates me outputting Cooperate.")
I assume that X is variable based on the amount of quoted code you're evaluating; in that case I would submit "tit for tat, defect last 3" but obfuscate my source code in such a way that it took exactly 10,000 instructions to output, or make my source code so interdependent that you'd have to quote the entire thing, and so on. I wonder how well this "cloaked tit-for-tat" would go.
My submitted bot would defect whenever it couldn't finish its calculation.
Good point. Obfuscated decision process is evidence of sneakiness. Like hiding a negation somewhere you think they won't look.