only for internal use.

The rules are modified to speed up play significantly:

1. Sets to 4.  You only need to win 4 games to win a set
2. No AD Scoring.   At deuce (40-40), the next point wins the game. The receiver gets to choose which side (deuce or ad court) they want to receive the serve from. 
3. Tie-Breaker at 3-3: If the set score is 3 games all, you play a standard tie-breaker. 
4. Lets are Played: If the serve hits the net and goes in, you play on. 
5. Switch sides every third game.