Computing the (Nash) equilibrium payoffs in a given bimatrix game (i.e., a finite two-person game in strategic form) is a problem of considerable practical importance. One algorithm that can be used for this purpose is the Lemke-Howson algorithm (Lemke and Howson (1964); von Stengel (2002)), which is guaranteed to find one equilibrium. Another, more elementary, approach is to compute the equili...