10.1. Either player may stop play during the rally and appeal against any lack of call by the Marker by saying “Appeal, please.”
10.2. The loser of a rally may appeal against any call or lack of a call by the Marker by saying “Appeal, please.”
10.3. If the Referee is uncertain which return is being appealed, the Referee must ask for clarification. If there is more than one appeal, the Referee must consider each one.
10.4. After the ball has been served, neither player may appeal anything that occurred before that
serve, with the exception of a broken ball.

10.5. At the end of a game any appeal regarding the last rally must be immediate.

10.6. In response to an appeal against a Marker’s call or lack of call the Referee must:
10.6.1. if the Marker’s call or lack of call was correct, allow the result of the rally to stand; or
10.6.2. if the Marker’s call was incorrect, allow a let, unless the Marker’s call interrupted a
winning return by either player, in which case award the rally to that player; or
10.6.3. if the Marker made no call on a serve or return that was not good, award the rally to
the other player; or
10.6.4. if the Referee was uncertain whether the serve was good, allow a let; or
10.6.5. if the Referee was uncertain whether the return was good, allow a let, unless the
Marker’s call interrupted a winning return by the other player, in which case award
the rally to that player.

10.7. In all cases the Referee’s decision is final.