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We submitted two kinds of strategies to the iterated prisoner's dilemma (IPD) competitions organized by Graham Kendall, Paul Darwen and Xin Yao in 2004 and 2005. Our strategies performed exceedingly well in both years. One type is an intelligent and optimistic enhanced version of the well known TitForTat strategy which we named OmegaTitForTat. It recognizes common behaviour patterns and detects and recovers from repairable mutual defect deadlock situations, otherwise behaving much like TitForTat. The second type consists of a set of strategies working together as a team. These group strategies have one distinguished individual Godfather strategy that plays OmegaTitForTat against non-members while heavily profiting from the behaviour of the other members of his group, the Hitman. The Hitman willingly let themselves being abused by their Godfather while themselves lowering the scores of all other players as much as possible, thus further maximizing the performance of their Godfather in relation to other participants. The study of collusion in the simplified framework of the iterated prisoner's dilemma allows us to draw parallels to many common aspects of reality both in Nature as wel

Author

Slany, Wolfgang; Kienreich, Wolfgang

Published

2006

Language

EN