 The predominant view seems to be that, when imperfection is inevitable, successful strategies will have to be more forgiving of defections by their opponents (since those defections might well be unintended). Molander 1985 demonstrates that strategies that mix TFT with \(\bCu\) do approach a payoff of \(R\) as the probability of error approaches zero. When these mixes play each other, they benefit from higher ratios of \(\bCu\) to TFT, but if they become too generous, they risk exploitation by “stingy” strategies that mix TFT with defection. Molander calculates that when the mix is set so that, following a defection, one cooperates with probability \(g(R, P, T, S) = \min\{1-(T-R)/(R-S), (R-P)/(T-P)\}\), the generous strategies will get the highest score with each other that is possible without allowing stingy strategies to do better against them than TFT does. Following Nowak and Sigmund, we label this strategy generous TFT, or GTFT. When payoffs have the common values 5,3,1,0 (as in Axelrod 1984), GTFT cooperates after every instance of an opponent's cooperation and after 25% of an opponent's defections.