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Design of Multi-Agent Systems Teacher Bart Verheij Student assistants Albert Hankel Elske van der Vaart Web site http://www.ai.rug.nl/~verheij/teaching/dmas/ (Nestor contains a link)

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The prisoner’s dilemma tournament The prize (which hasn’t arrived yet …)

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The prisoner’s dilemma tournament 6 pools, 2 semi-finals, 1 final One player was disqualified Some strategies were submitted several times Some rounds were won by ‘penalties’ (i.e., actually a draw) Some strategies used the code creatively (but did not win) The winner submitted a strategy designed using false assumptions... The winner was really a TIT-FOR-TAT clone...

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Semi-finals Matthijs Marnix Dimitri Harmen Mark Peter

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Final Harmen vs Matthijs

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The winner’s code if(strategy.equals("MATTHIJS")) { int count = 0; int atmost = encounters; if(atmost >= 10) atmost = 9; for(int i = 0; i < atmost; ++i) { if(memory[playerID][i]) count++; } double ratio = (double)count / ((double)atmost + 1.0); if(ratio < 0.4) {//vaak defect, dan zelf ook defect return false; } else if(ratio > 0.8) {//vaak cooperate dus zelf ook cooperate return true; } else {//TIT-FOR-TAT if(encounters <= 0) { action = true; } else { action = memory[playerID][0]; }

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