Factors in the art of warfare are: First, calculations; second, quantities; third, logistics; fourth, the balance of power; and fifth, the possibility of victory is based on the balance of power.
When your opponent gives you an opening, be swift as a hare.
Pretend inferiority and encourage his arrogance.
Invincibility lies in the defense; the possibility of victory in the attack.
If your enemy is superior, evade him
All warfare is based on deception. Hence, when able to attack, we must seem unable; when using our forces, we must seem inactive; when we are near, we must make the enemy believe we are far away; when far away, we must make him believe we are near.