Score In A Set
Rule 6

6. SCORE IN A SET (OLD 27)
There are different methods of scoring in a set. The two main methods are the Advantage Set and the Tie-break Set. Either method may be used provided that the one to be used is announced in advance of the event. If the Tie-break Set method is to be used, it must also be announced whether the final set will be played as a Tie-break Set or an Advantage Set.
a. Advantage Set
The first player/team to win six games wins that Set, provided there is a margin of two games over the opponent(s). If necessary, the set shall continue until this margin is achieved.
b. Tie-break Set
The first player/team to win six games wins that Set, provided there is a margin of two games over the opponent(s). If the score reaches six games all, a tie-break game shall be played.
Additional approved alternative scoring methods can be found in Appendix IV.