The males tend to play aggressive openings against female opponents
of the same playing strength, even if it increases the probability of losing the game. That has to be classified as irrational behavior. Paper by Swedish researcher Patrik Gränsmark.
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Read Paper by Swedish researcher Patrik Gränsmark.

The figure displays how the judges reasoned when labeling an opening as either aggressive or solid.

of the same playing strength, even if it increases the probability of losing the game.