Know your enemy and know yourself
– your victory will be painless.
Know the weather and the field
– your victory will be complete.
Carefully compare the opposing army with your own, so that you may
know where strength is superabundant and where it is deficient.
You can deter your potential enemy by using his
weaknesses against him.
If the enemy has a strong position, entice
him away from it.
If the enemy is confused, be decisive.
If the enemy is solid,
prepare against him.
If the enemy is
strong, avoid him.
If the enemy is angry, frustrate him.
If the enemy is weaker, make him arrogant.
If the enemy is relaxed, make him work.
If the enemy is united, break him apart.
Attack him when he is unprepared. Leave when he least expects it.