In war, practise dissimulation, and you will succeed.
According to Tu Mu, 立 stands for 立勝. Cf. I. § 18. In the tactics
of Turenne, deception of the enemy, especially as to the numerical
strength of his troops, took a very prominent position.[172]
Move only if there is a real advantage to be gained.
This is the interpretation of all the commentators except Wang
Hsi, who has the brief note 誘之也 “Entice out the enemy” (by
offering him some apparent advantage).