Indeed. "All Warfare is based on deception."
There is also Lord T'an's Strategy #27: Feign Stupidity while Not Being Injudicious.
Zi Ma Chong-ta deceived Cao Shuang by deliberately masquerading as a drunken idiot in Romance of the Three Kingdoms, and it worked smashingly. It's so ironic that Beijing fails to recognize when Western Powers apply ancient Chinese wisdom.