On Grandmaster Chu Shong Tin’s DVD he explained a principle of how to rotate the wrist as if turning a bead inside the wrist.
I pointed out to my student that this was similar to the practice of the 3-Count in Beginning Posture as explained on Page 133-134, TaijiKinesis Vol 2. At the beginner level we do it in a way to eliminate power leakage by observing certain restrictions when moving the hand-arm.
At a higher level when we add in the principle of the 9-Pearls the rotation would be very similar to what GM Chu explained in his DVD.
Its important that we test the flow of our power as described on Page 260, TaijiKinesis Vol 2 to see if we really understand how to do this or our perception of mastery is just an illusion.
So whilst I applaud that my student was able to describe the ground path correctly, however, when I tried the test on him he was not able to issue the power. One reason is because when he did BP(iii)-(iv) the alignment was a bit off thus subsequently leading to it affecting the ability to issue power in BP(vi).
Thus, to learn Tai Chi principles properly do not assume that you are doing everything properly, that if you are even doing everything that you should be doing in the first place. The key to entering the gate of mastery is by doing the principles properly, naturally and in tandem with each other. Sounds difficult but really its nothing but to be aware and focused each time you practice. And of course, practice, practice and more practice.