Anthropomachia
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In 1980 Robert Axelrod held a tournament where contestants could submit simple programs to compete in an iterated prisoner’s dilemma in order to see which strategies performed the best over time. He performed this tournament a few different times, in a few different ways and wrote a book on it called The Evolution of Cooperation which was published in 1984. It’s probably worth a read if you have the time, but to cut to the chase, the program that performed the best in the widest variety of matchups was running an extremely simple algorithm called TIT-FOR-TAT.

TIT-FOR-TAT operated on the premise that it would “cooperate” the first round, and then in every sub…

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