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. Author manuscript; available in PMC: 2008 Jul 14.
Published in final edited form as: J Theor Biol. 2007 Mar 24;247(3):574–580. doi: 10.1016/j.jtbi.2007.03.027

Fig. 1.

Fig. 1

WSLS cooperates against itself most of the time: A mistake by one of two players that use WSLS triggers a single round of punishment and then both return to cooperation. Moreover, WSLS can exploit unconditional cooperators, so that WSLS is proof against random drift to ALLC.