Beating the Prisoner's Dilemma

Here's an older article telling how a new system beat the old champions in an ongoing Prisoner's Dilemma scenario. Tit for Tat is no longer the reigning strategy champion.

The trick is to have your opening moves signal to your opponent. If they are from your "team", one becomes the "master" and takes the winning strategy, and the other becomes a "slave" and adopts a strategy that will give the "master" the biggest payoff. Basic sacrificial tactics. Apparently Southampton took the top three positions in this competition, along with most of the bottom ones. Not sure how it would do in any other circumstances, though.