A note on Cantonese
I use the Jyut Ping (粵拼) Cantonese writing system as I have found it to be the most accurate. For an excellent way to learn Cantonese pronunciation, see Fluent Forever. For a dictionary see CantoDict or use the Hanping Cantonese App for Android.
Here is the rectangle drawn in full:
The Practical Wing Chun ‘Rectangle’
By drawing lines in this way we can map out the area in front of us we want to control.
1 – First we draw a rectangle around our fists, hanging down by our sides:
To get the ideal Wing Chun range with our opponent, we must be able to put our hands on their shoulders with our arms outstretched at 180° and our torso vertical.
2 – Then we add a vertical line down the middle (the 1st centreline) and a horizontal line where the arms bend (the 2nd centreline):
Rectangle with 1st and 2nd centrelines
Any incoming punch on or to the left of your 1st centreline will ideally be dealt with by your left hand. Any incoming punch on or to the right of your 1st centreline will ideally be dealt with by your right hand.
Any incoming punch on or above your 2nd centreline will ideally be dealt with by an upper move (e.g. Soeng Gaau Caa Sau). Any incoming punch on or below your 2nd centreline will ideally be dealt with by a lower move (e.g. Haa Gaau Caa Sau).
3 – Then we draw lines in between the vertical and horizontal lines to make the ‘braces’ and 3rd centrelines:
Rectangle with ‘braces’ and 3rd centrelines
The ‘braces’ lines are the endpoint for your elbow when performing a diagonal move (e.g. Hoi). They are also the endpoint for your elbows when performing some double-handed, frontal moves (e.g. SLT Fan Sau, SLT Biu, CK Tik Sau etc).
The 3rd centrelines are the ideal contact point either between your shoulder and your elbow, or between your elbow and the end of your fist. This is because in the elbow to fist example, you split the difference between being able to punch or elbow when you have a touch. In the shoulder to elbow example, you split the difference between being able to elbow or shoulder strike.
4 – Finally we can see the applications for the lines around the edge as well as a further application for the 2nd centreline:
Rectangle with side lines explained
2 Vertical Side Lines:
The 2 vertical side lines are the maximum you want to turn your 1st centreline towards on your opponent when doing a move with Zyun Maa (turning the body). Any further and you risk being unable to deal with the hand of theirs that you’ve turned away from (e.g. with your right Bong Sau vs their left Punch, turn to face their right shoulder and no more).
3 Horizontal Lines:
The 3 Horizontal Lines are where you strike with the 3 Horizontal Palms from the 3rd Section Siu Nim Tao:
Lower Horizontal Line – Dai Waang Zoeng (Lower Horizontal Palm) – ideally to the pelvis
Middle Horizontal Line – Peng Waang Zoeng (Middle Horizontal Palm) – ideally to under the ribs
Upper Horizontal Line – Gou Waang Zoeng (High Horizontal Palm) – ideally to the chin