masterstroke
noun [ C usually singular ] uk/ˈmɑː.stə.strəʊk/ us/ˈmæs.tɚ.stroʊk/
绝招，高招；妙举
an action that is very clever and produces success
His decision to change the team's formation for the final game was a masterstroke. 在决赛时改变阵形，他的这一决定真是神来之笔。