Scoring
Kicks score only if they start outside the square or on the line. Bottle hits are worth 2. Each stick is worth 1.
Turn Flow
Each side gets up to 3 kicks. A scoring kick ends the turn. The next touch is a serve, and serves never score.
Bottle Break
The bottle must be weakened by legal bottle hits before it can break. Serve hits do not weaken it. A break ends the match immediately.
Winning
Score exactly 21. If you go over before overtime, you drop to 15. Once both sides are at 20 or more, it is win by 2.