Greetings all,
Great dialogue! There has been great food for thought. Unfortunately, I have been busy with this or that and so have not been able to participate as much as would like. Here are a few more thoughts, however.
發勁須上下相隨,乃能一往無敵. 立身須中正不偏,方能八面支撐.
To issue energy you must mutually coordinate upper and lower, then you can issue in one direction without equal. The upright body must be centered and correct and not lean, only then can you support [force] from the eight directions.
FYI, at I recent seminar in Connecticut (which I really enjoyed), Master Yang Jun quoted "立身須中正 that Dave kindly translated as "The upright body must be centered and correct and not lean." He explained that the 中 (zhōng) of 中正 (zhōngzhèng) does not really mean in the middle or in the center, but suggests more finding a place of harmony between extremes.
I can’t quite agree, Audi, that it’s a yin/yang pair; I think it’s just two desirable taiji skills.
My understanding is different. By sticking to an opponent, I am not trying to control him; I am in fact yielding to him. I yield not only to his movement, but to his intention as well. I am letting him do whatever he wants; I am not imposing my intention on him. (Louis had a discussion with Omar a couple of years ago about this line. I liked Louis' explanation very much. The relevant post is here.)
If the opponent pushes me, I stick to him and go where he wants me to go; and by sticking to him I understand his push and am able (hopefully) to change and yield. If I push him, I merely stick and follow wherever he wants to go; and by doing so (hopefully) be comes to a point where he feels trapped, he stiffens up, and I am able to issue energy to put him out. This issuing is what I understand by the yang side of the sticking/yielding yin.
My words reflect my own thoughts and understanding, rather than my teacher's words; however, at the seminar I attended, Master Yang used the word "control" over and over again. During the push hands portion, he even had us do "simple" exercises where he had us practicing free one-hand circles in four ways: with one partner being yin and the other yang, the reverse, one partner forcing the other to remain yin, and one partner forcing the other to remain Yang. As I understood it, sometimes you want to be leading and sometimes you want the opponent/partner to lead
Our basic/intermediate push hands may be somewhat different than what I see usually demonstrated on YouTube. Our basic practice involves neither free pushing nor set pattern circling looking for a defect or opening. We learn both to initiate and to react to initiation. At the seminar, Master Yang quoted the maxims "If the opponent doesn't move, you don't move; if the opponent moves even slightly, you move first" and "Launch later, but arrive first." He explained that this doesn't literally mean that you can do nothing if the opponent does not move or give you the energy you need. You always have the option of inducing the opponent to act in the way you need.
According to my understanding and the references Master Yang has made in the past, our touchstone in this is Sunzi's Art of War. You cannot force victory unless the opponent give you the opportunity: however, nothing prevents you from trying to create such opportunities. Caution dictates that you usually want to wait for your opponent/partner to reveal his or her full and empty before doing anything, but if you must you can use an "empty" motion to encourage this.
When we first start practicing applications, we do it out of the circling, typically our vertical two-hand circle. The partner need not have any attacking intent and does not need to make a mistake or have a defect in her or his structure. You are expected to learn how to induce your partner to give you the energy you need for your technique. In these circumstance, you begin in control. We then learn to counter. In those cases, your partner begins in control, but you take it over.
I hope this clarifies things.
Take care,
Audi