Zheng Yubo's billiards teaching didn't say that sideways is to weaken the impact of kick-off. Fairness and justice are always the premise of professional competition. In fact, the essence of this adjustment is to continue to use swing paper, and on the premise of ensuring fairness, use side kick to weaken the impact of kick-off on the game, greatly increasing the ornamental of the game and achieving a balance between competitiveness and ornamental.