In his book "The Selfish Gene", Richard Dawkins says that retaliator emerges as an evolutionary stable strategy. But I think dove is also a kind of retaliator and so if dove increases, the hawks and others can exploit them.
Is retaliator an ESS? If not, which strategy is ESS?
hawk : They always fight hard and retreat only when injured.
doves : They merely threaten in a dignified way and never hurt anyone.
If a hawk fights a dove, dove runs away. If dove meets dove they go on posturing until one of them is tired and retreats. If a hawk meets hawk they fight until someone gets seriously injured or dies.
retaliators : A retaliator plays dove at the beginning of every fight. If opponent attacks, he attacks , if opponent behave like a dove he behaves like a dove. When 2 retaliators meet they behave like doves.
bully : A bully behave like a hawk until someone hits back. Then, he runs away.
prober retaliator : He is like a retaliator but he tries a brief escalation of the contest. He is hawk like if opponent doesn't strike back. If opponent strikes back he behave like a dove. If he is attacked he retaliates.
The pay offs: 50 for winning, 0 for losing, -100 for being seriously injured. and -10 for wasting time in a long contest.
Source: The Selfish Gene