1. The first referee can blow the whistle to penalize.
2. The penalty for this foul is the main responsibility of the second referee.
3. When judging a crossing foul, it is necessary to observe whether it hinders the opponent's game. If it does not hinder, it is not a foul.
4. Players can cross and enter the opponent's barrier-free area without affecting the opponent's game.
5. The referee must see the entire sole of the foot or palm of the hand cross the center line and touch the opponent's court before he can blow the whistle to make a penalty.
6. Players are not allowed to touch the opponent's court except their hands and feet. Otherwise, it will be considered a foul of crossing the center line.
7. When the referee sees the players of both sides dunking or blocking, he should pay attention to the movement in front of the net. The second referee should keep his sight on the center line for a while after the players have finished hitting the ball.
Touching the net and the marker pole
Touching the net and the marker pole is not a foul, but it is a foul for players to touch the net or the marker pole when trying to hit the ball or affecting the game. Players can touch the net post, the net rope outside the full length of the net, or any other object after hitting the ball, but they must not affect the game.














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