Figure 5. The visible evaluation model of the tactical benefit of the fourth to sixth strokes in the receiving round. The median tactical frequency and scoring rate in the tactics of the fourth to sixth strokes are 0.021 and 0.398, respectively. Therefore, the tactical benefit value ranges of the four areas are (0.212, 5]; (0, 0.212]; [-0.212, 0) and [-5, -0.212), respectively.