Network reciprocity on spatial prisoner´s dilemma games by Continuous-binary strategy

For 2 × 2 games, especially the Spatial Prisoner´s Dilemma (SPD), most of the previous studies presumed that players can offer either cooperation (C) or defection (D), the so-called discrete strategy. In this paper, we define Continuous-binary strategy instead of discrete strategy. And a systematic series of numerical simulations reports that it enhances the network reciprocity for SPD. This new strategy is based on our previous finding that continuous and mixed strategy are robust in boundary games of Chicken and PD (BCH), and Stag Hunt and PD (BSH), respectively. The new strategy allows to put both advantages of continuous and mixed strategies on usual discrete strategy together in one model.