Yang style Tai Chi - Yielding to force

From Cheng Tzu's Thirteen Treatises on Tai Chi Chuan

Treatise One
Explanation of the Name and Definition

Martial arts have been developed to increase both wisdom and bravery.  In Chinese philosophy T'ai Chi is the mother of yin and yang.  There is nothing it does not contain.  From the primordial T'ai Chi, comes the name of our martial art.  The Book Of Changes states that T'ai Chi gives birth to the Liang I (the Two Primordial Powers), yin and yang.  Extreme yin produces yang, and extreme yang produces yin.  In the altercation of hard and soft, and movement and stillness, each is applied to its limit.

People who are fond of fighting like to use martial arts to battle.  Losing or winning is determined by the relative level of martial skills.  These types invariably use hard force to strike and quick techniques to control opponents.  This is the extreme limit of yang, and the extreme limit of hardness.  If one uses hardness to resist, then both sides are certain to lose or be injured.  This is not the way of a great master.  Therefore, when others use hardness, I use softness to neutralize it.  When others use movement to attack, I use stillness and wait for the attack and neutralize it.  Extreme softness and stillness is the fruition of yin. When extreme yang encounters extreme yin, the yang will always be defeated.