his mastery of chess

• 他的棋艺(或棋术)

his mastery of chess的用法和样例：

例句

1. His skill in chess is unmatched in the school.
   他的棋艺在全校是独一无二的。
2. You have to face the fact that she's better at chess than you.
   你必须面对她的棋艺比你高的事实。