Lets

A Let is an undecided stroke, and the service or rally in respect of which a Let is allowed, shall not count and the Server shall serve again from the same box.
(a) A let may be allowed
(i) If the striker refrains from hitting the ball owing to a reasonable fear of injuring the opponent.
(ii) If the striker, on the way to playing the ball incurs sufficient interference to impede their access to the ball when the striker would have otherwise played a good shot.
(iii) If the Referee is asked to decide an appeal and is unable to do so.
(b) A Let shall be allowed
(i) If the Receiver is not ready, and does not attempt to take the service.
(ii) If the ball breaks during play.
(iii) If an otherwise good return has been made, but the ball goes out on its first bounce.
iv) If the ball in play touches the receiver or anything carried or worn by the receiver whilst on the way to the side wall or back wall in anticipation that the ball would have reached the front wall and hence been a good return.