If we draw an isosceles triangle on the floor, for which our body forms the base, and our arms form the equal legs of the triangle, then h (height of the triangle) is that same centerline.
The Wing Chun concept is to exploit, control and dominate an opponent's centerline.
All attacks, defenses, and footwork are designed to guard your own centerline while entering your opponent's centerline space.
Lee incorporated this theory into JKD from Wing Chun.
The three guidelines for centerline are:
The one who controls the centerline will control the fight.
Protect and maintain your own centerline while you control and exploit your opponent's.
Control the centerline by occupying it.
This notion is closely related to maintaining control of the center squares in the strategic game chess.
The concept is obviously present in Xiangqi (Chinese chess), where an "X" is drawn on the game board, in front of both players' general and advisors.
