Page "Unbeatable strategy" Paragraph 1

: " In the way in which the success of a chosen sex ratio depends on choices made by the co-parasitizing females, this problem resembles certain problems discussed in the " theory of games.

" In the foregoing analysis a game-like element, of a kind, was present and made necessary the use of the word unbeatable to describe the ratio finally established.

This word was applied in just the same sense in which it could be applied to the " minimax " strategy of a zero-sum two-person game.

Such a strategy should not, without qualification, be called optimum because it is not optimum against-although unbeaten by-any strategy differing from itself.

This is exactly the case with the " unbeatable " sex ratios referred to.

" Hamilton ( 1967 ).