New strategy for the Prisoners' Dilemma.

Amazing that there is more to discover in the iterated prisoners' dilemma after sixty years of study.

Zero-determinant "extortion" strategies allow one player to set the other player's maximum score with no need to remember past interactions.

Fascinating. And a shame that generous tit-for-tat is no longer the best strategy. It made such a good story.

Good summary of the paper:

On "iterated Prisoner’s Dilemma Contains Strategies That Dominate Any Evolutionary Opponent"  | Conversation | Edge

"Robert Axelrod's 1980 tournaments of iterated prisoner's dilemma strategies have been condensed into the slogan, Don't be too clever, don't be unfair. Press and Dyson have shown that cleverness and u…