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Definition: Tit-for-tat is a strategy in a repeated game (or a series of similar games). When a Prisoner's dilemma game is repeated between the same players, the tit-for-tat strategy is to choose the 'cooperate' action unless in the previous round, one's opponent chose to defect, in which case one responds by choosing to defect this round. This tends to induce cooperative behavior against an attentive opponent.


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