Greetings ChiDragon,
What I have learned from my teachers is that our Tai chi draws from many sources of Chinese philosophy, but nevertheless is something unique. We draw on Sunzi and the Militarists (兵家), but do not necessarily use everything they talk about.
Sunzi said:
All warfare is based on deception" (兵者,詭道也。).
This is an idea I do not think we use in our Tai Chi.
Sunzi also said:
If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle. (知彼知己,百戰不殆;不知彼而知己,一勝一負;不知彼不知己,每戰必殆。).
We definitely use this idea.
We want to "distinguish/divide up full and empty" (分虚实) and thus know our own full and empty and that of our opponent. On the other hand, we do not want our opponent to know our full and empty or be able to distinguish/divide up their full and empty. If you understand Sunzi's idea, it is much easier to understand the Tai Chi idea.
If you understand the Tai Chi idea, it is easier to understand why we place such an emphasis on sticking. Without sticking, it is extremely difficult to get an accurate read on the opponent's status of full and empty. Without sticking, it is impossible to accurately affect the opponent's full and empty.
Sunzi said:
To ensure that your whole host may withstand the brunt of the enemy's attack and remain unshaken-- this is effected by maneuvers direct and indirect.
That the impact of your army may be like a grindstone dashed against an egg--this is effected by the science of weak points and strong.
In all fighting, the direct method may be used for joining battle, but indirect methods will be needed in order to secure victory.
三軍之衆,可使必受敵而無敗者,奇正是也;兵之所加,如以碫投卵者,虛實是也。
(Here the translator used “weak (points) and strong” to translate what we have been referring to as “empty” and “full” (虛實). In Sunzi’s context, I think this is defensible.)
In our Tai Chi, we definitely use some of the same concepts of weak (empty) and strong (full), but do not use the ideas of “direct” and “indirect.”
It is also said that if the opponent does not move, you do not move, but if the opponent makes the slightest move, you move first.
Without movement and the separation of Yin and Yang, it is hard to know the opponent’s empty and full. Without knowing the opponent’s empty and full, it is hard to know what to attack and what to defend. If we move independently, we risk revealing our own empty and full and exposing vulnerability.
Sunzi says:
The spot where we intend to fight must not be made known; for then the enemy will have to prepare against a possible attack at several different points; and his forces being thus distributed in many directions, the numbers we shall have to face at any given point will be proportionately few.
For should the enemy strengthen his van, he will weaken his rear; should he strengthen his rear, he will weaken his van; should he strengthen his left, he will weaken his right; should he strengthen his right, he will weaken his left. If he sends reinforcements everywhere, he will everywhere be weak.
Numerical weakness comes from having to prepare against possible attacks; numerical strength, from compelling our adversary to make these preparations against us.
(吾所與戰之地不可知,不可知,則敵所備者多,敵所備者多,則吾之所與戰者寡矣。故備前則後寡,備後則前寡,備左則右寡,備右則左寡,無所不備,則無所不寡。寡者,備人者也;衆者,使人備己者也。)
If in push hands, you perceive one part of the enemy to be full or strong in energy, then you know what other part is empty or weak in energy. If all parts are full or strong, you know that all parts are empty or weak. This is being double weighted.
Sometimes in our push hands, you may know that one part is full or strong in energy, but you need it to be the opposite. If you are in contact with that part, there are many things you can do directly; however, even if you are not in contact, you can act if you understand the principle of the Taiji. We can make that part empty or weak merely by making another part full or strong. Understanding these relationships is why we say that our Tai Chi is not about who is stronger, but rather about what is strong or full and what is weak or empty.
Take care,
Audi