So in war, the way is to avoid what is strong, and strike at what is weak.
In the midst of chaos, there is also opportunity.
Concentrate your energy and hoard your strength.
In desperate position, you must fight.
When you are ignorant of the enemy but know yourself, your chances of winning or losing are equal.
Do not press an enemy at bay. Prince Fu Ch'ai said: "Wild beasts, when at bay, fight desperately. How much more is this true of men! If they know there is no alternative, they will fight to the death.