You may advance and be absolutely irresistible, if you make for the enemy＇s weak points; you may retire and be safe from pursuit if your movements are more rapid than those of the enemy.
故我欲战，敌虽高垒深沟，不得不与我战者，攻其所必救也；
If we wish to fight, the enemy can be forced to an engagement even though he be sheltered behind a high rampart and a deep ditch. All we need do is attack some other place that he will be obliged to relieve.
我不欲战，虽画地而守之，敌不得与我战者，乖其所之也。
If we do not wish to fight, we can prevent the enemy from engaging us even though the lines of our encampment be merely traced out on the ground. All we need do is to throw something odd and unaccountable in his way.
故形人而我无形，则我专而敌分。
By discovering the enemy＇s dispositions and remaining invisible ourselves, we can keep our forces concentrated, while the enemy＇s must be divided.
我专为一，敌分为十，是以十攻其一也。
We can form a single united body, while the enemy must split up into fractions. Hence there will be a whole pitted against separate parts of a whole, which means that we shall be many to the enemy＇s few.
则我众敌寡，能以众击寡者，则吾之所与战者约矣。
And if we are able thus to attack an inferior force with a superior one, our opponents will be in dire straits.
吾所与战之地不可知，不可知则敌所备者多，敌所备者多，则吾所与战者寡矣。
The spot where we intend to fight must not be made known; for then the enemy will have to prepare against a possible attack at several different points; and his forces being thus distributed in many directions, the numbers we shall have to face at any given point will be proportionately few.
故备前则后寡，备后则前寡，备左则右寡，备右则左寡，无所不备，则无所不寡。