Golf isn't a sport where you can play defense against your opponent, but once you could. For many years in singles match play, a person wasn't allowed to move his or her ball on the green even if it was directly in an opponent's path. A player facing the obstacle while trying to hole out was known as being "stymied." They could either try to putt around an opponent's ball or putt or chip over it. There were revisions to this rule over the years before it was totally abolished worldwide in 1952.