It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle.

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.

To a surrounded enemy, you must leave a way of escape.

The Art of War is self-explanatory

It is sufficient to estimate the enemy situation correctly and to concentrate your strength to capture him. There is no more to it than this. He who lacks foresight and underestimates his enemy will surely be captured by him.

If your opponent is of choleric temper, seek to irritate him. Pretend to be weak, that he may grow arrogant.

Making no mistakes is what establishes the certainty of victory, for it means conquering an enemy that is already defeated.