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The Iterated Prisoners Dilemma Competition : Celebrating the 20th Anniversary. See http://www.prisoners-dilemma.com/ To pay tribute to the 20th anniversary of the Iterated Prisoners Dilemma competitions organised by Robert Axelrod, we are planning a series of updated competitions to celebrate this milestone. Importantly we aim to provide the environment and data to allow researchers to conduct investigations into the latest developments surrounding the iterated prisoners dilemma. The competitions we are planning are: 1. Re-run the original experiment of Axelrod. We aim to see if a tit-for-tat strategy still dominates or whether somebody can develop a better strategy taking into account that there has been 20 years since the original competition (for example, tit-for-2-tats was claimed to be better than tit-for-tat). Due to the internet we hope to receive more entries than was possible in 1984, thus giving us access to much more data. 2. Organise a competition that has noise in the data. That is, a signal to cooperate or defect could be mis-executed. 3. Allow competitors to submit a strategy to an IPD that has more than one player and more than one payoff, that is, multi player and multi-choice. More details about the competition can be found at http://www.prisoners-dilemma.com/. We would welcome any feedback. Please distribute this call to anybody who you think might be interested. Organisers ========= This competition is being jointly organised by Graham Kendall (University of Nottingham, UK), Paul Darwen (Protagonist, Australia) and Xin Yao (University of Birmingham, UK) The competition is sponsored by the UK's largest research council (EPSRC: Engineering and Physical Sciences Research Council)