Picture this: you and a partner have committed a crime. The police have arrested you both, but they don't have enough evidence to lock you up and throw away the key unless one of you rats out the other. They interrogate you in separate rooms and offer you a deal. Should you keep quiet or betray your partner? This "prisoner's dilemma" is a classic psychology game used to study how collaboration evolves in animal societies. Now, a pair of mathematicians have identified a new way of playing the game that allows a player to do significantly better than their opponent.
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