他在象棋比赛中臭名昭著，总是装作初学者然后突然击败对手。

He's a notorious ___sandbagger in chess tournaments, pretending to be a beginner and then suddenly defeating opponents.

那个高尔夫球手一开始假装技术很差，结果发现他其实是个隐藏的高手。

The golfer pretended to be bad at first, but turned out to be a real ___sandbagger.