The length of the competition area is 2m, and the width is 15m (5cm), which is defined by the outer edge of the belt-shaped competition line. The restricted area is the area within 0.5 ~1meter outside the competition area, which is delineated by the outer edge of the belt-shaped limit line.

The matching line consists of four angles, which are called the first angle, the second angle, the third angle and the fourth angle (referred to as the first angle, the second angle, the triangle and the fourth angle for short) in the counterclockwise direction.