Bóng đá

1. Move in to prearranged marking position quickly.
2. Mark close in the area of the ball.
3. Mark in back of the attacker.
4. Mark the space in front of the attacker.
5. The goalkeeper be in the right position.
6. Seal off as much space as possible inside the penalty area.
7. Player in the wall line up, tallest on the outside (in line with ball and post) and the shortest is on the inside.