In the evolutionary game, the introduction of the third or more specific strategies to study cooperative evolution has attracted widespread attention recently. The main feature of this paper is to adopt a special reward strategy as the third choice to observe the evolution dynamics. This strategy can improve the utilization of resources and help cooperators and defectors get greater benefits. We investigate the evolutionary game dynamics of a three-strategy snowdrift game with special reward strategy and payoff delay. First, for the nondelay system, we discuss the dynamic properties of strategies, including the existence, stability and bistability of equilibrium states. Furthermore for the t... More >