 Grim, Mar and St Denis report a number of SPD simulations with a greater variety of initial strategies. In general their observations confirm the plausible conjecture that cooperative outcomes are more common in SPDs than ordinary EPDs. Simulations starting with all of the pure reactive strategies of Nowak and Sigmund (i.e., all of the strategies \(\bR(y,p,q)\) described above where \(y\), \(p\), and \(q\) are either 0 or 1.), all ended with TFT—i.e., with \(\bR(1,1,0)\)—as the only survivor (though other outcomes—including one in which \(\bDu\) is the sole survivor and ones in which \(\bCu\) and TFT are intermixed—are clearly possible.) Simulations starting with all of the 64 possible pure strategies in which a move may depend on the opponent's previous two moves, ended with mixed populations of survivors employing a variety of TFT-like strategies. They all defect after a double defection (\(\bD\)\(\bD\)), though not necessarily after a single defection \(\bC\)\(\bD\) or \(\bD\)\(\bC\)); they all cooperate after a double cooperation, though not necessarily after a single cooperation; they all cooperate in the second round of the game, though not necessarily in the first). (Again, other outcomes are possible.) Simulations starting with many (viz., 100) evenly distributed samples of Nowak and Sigmunds mixed reactive strategies, tended to be taken over by \(\bR(.99,.1)\), which is a version of generous TFT with less than half the generosity of GTFT. Simulations beginning with a random selection of a few (viz., 8) of these strategies tended to evolve to a mixed stable or cyclic pattern dominated by a single version of generous TFT with considerably more generosity than GTFT. \(\bR(.99,.6)\), which is more than twice as generous as GTFT, seems to have been a frequent victor.