Figure 6. The visible evaluation model of the tactical benefit of the second to fourth strokes in the receiving round by a Chinese player. The median tactical frequency and scoring rate in the tactics of the second to fourth strokes are 0.022 and 0.556, respectively. Therefore, the tactical benefit value ranges of the four areas are (0.121, 5]; (0, 0.121]; [-0.121, 0) and [-5, -0.121), respectively.