From chapter 1 of Sun Tzu's The Art of War-Lionel Giles Translation
18. All warfare is based on deception.
19. Hence, when able to attack, we must seem unable; when using our forces, we must seem
inactive; when we are near, we must make the enemy believe we are far away; when far away, we
must make him believe we are near.
20. Hold out baits to entice the enemy. Feign disorder, and crush him.
21. If he is secure at all points, be prepared for him. If he is in superior strength, evade him.
22. If your opponent is of choleric temper, seek to irritate him. Pretend to be weak, that he may grow
arrogant.
everyone that wants to get better at Starcraft 2 or any RTS should read this book its less than 40 pages.