cousin_it comments on Prisoner's Dilemma (with visible source code) Tournament - Less Wrong
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There is a fair possibility that a number of programs whose dominant strategy is "cooperate with other dominant cooperators, do something else otherwise" (what ThrustVectoring calls AbsolutismBot "wrapper") will end up sharing the top spot with the same number of points. I wonder if it makes sense to discourage this approach in some way.
That depends on whether players get utility from PD payoffs or from winning the tournament. A clique that wants a high total payoff will use mutual cooperation. A clique that wants to grab the #1 spot will have all players sacrifice to one designated player.