If your opponent is of choleric temper, irritate him.

Be extremely subtle, even to the point of formlessness. Be extremely mysterious, even to the point of soundlessness. Thereby you can be the director of the opponent's fate.

Hence that general is skilful in attack whose opponent does not know what to defend; and he is skilful in defense whose opponent does not know what to attack.

Balk the enemy's power; force him to reveal himself.

If you are far from the enemy, make him believe you are near.

If ignorant both of your enemy and yourself, you are certain to be in peril.