Matching pennies games as asymmetric models of conflict.

De Dreu and Gross (D&G) seem to have disregarded some relevant experimental literature on games of conflict, most notably variations on "matching pennies" games. While in such games, "attacker" and "defender" are typically not explicitly labelled, players' differentiated roles yield naturally to such notions. These studies partly validate some of D&G's findings and interpretations.