Figure 2.

Relative inclusive fitness payoff of acting sequentially versus simultaneously as a function of relative strength, for two values of relatedness, (a) r=0.1; (b) r=0.5. Positive values of the relative inclusive fitness payoff indicate that a player prefers to play sequentially rather than simultaneously; negative values indicate the opposite. The role of first mover in a sequential game is more profitable than engaging in simultaneous competition regardless of whether stronger or weaker than one's opponent. The role of second mover, by contrast, is profitable only when stronger than the other player.