tegy q is given by the function A(p, = pAqT. We focus on stochastic evolutionary dynamics in well-mixed populations of finite size (Schaffer 1988, Kandori et al 1993, Kandori & Rob 1995, Schreiber 2001, Nowak et al 2004, Taylor et al 2004, Wild and Taylor 2004, Traulsen et al 2005, Antal & Scheuring 20