借刀殺人/Jie Dao Sha Ren – Borrow a Knife to Kill a Person
Original Text: When the enemy is already clear determine who his friends are, then guide a friend to kill the enemy, with no exertion on your part, using the implications of “Sun.”
Analysis: When your enemy’s situation is already clear but his allies’ attitude is not yet stable, you should guide his ally into going all out to kill the enemy without having to send your own troops to attack, allowing you to conserve your own strength. This is based on the Yi Jing. Sun Gua’s “First decrease, then increase” principle has clear implications, using other people’s loss as one’s own benefit is the method.