I used to think that if I was playing a friendly match against a player with a weak backhand, it was a bit unfair to always play his weakness. In the light of the foregoing, nothing could be further from the truth! If you play his backhand as much as you can, it can only get better as a result. If you are a nice guy and play his forehand, his backhand will remain weak; in this case the real nice guy is the competitor.