How strokes can be won

A player wins a stroke
a) If the server fails to make a good serve (See point 4 on the Service).
b) If the opponent fails to make a good return of the ball in play.
c) If the ball in play touches the opponent or anything carried or worn by the opponent whilst on the way to the front wall.
d) If a player drops the racket, calls out or in any other way distracts the opponent, and the Referee considers that such occurrence has caused the opponent to lose the stroke.
e) If the ball hits the ceiling or any object outside of the court.