Change a Losing Game

To adopt different tactics, in the hope of winning. Perhaps the best-known piece of advice in the literature of tennis instruction was Bill Tilden's "Never change a winning game: always change a losing game." He meant, for example, that if you have been winning by staying in the backcourt and trading drives, don't dream of getting fancy and storming the net so long as things continue to go well for you; but if you've been losing while sticking back there, then for heaven's sake start trying to play a completely different sort of game.