Why does Jin Song call Xu Yinchuan the boss?

Recognition of his chess skills. Xu Yinchuan is a super chess master from Chaoshan area of China. He is nicknamed General Jin in the world of chess, and his chess skills are also superb. In chess, Xu Yinchuan's winning percentage against Jin Song is as high as 8 1%, with 5 wins and 3 draws, calling Xu Yinchuan the boss, which shows that Master Jin Song has recognized Xu Yinchuan's chess skills.