All war is based on deception. Therefore, when capable, feign incapacity; when active, inactivity. When near, make it appear you are far away, when far away, that you are near. Offer the enemy a bait to lure him; feign disorder and strike him. When he concentrates, prepare against him; where he is strong, avoid him. Anger his general and confuse him. Pretend inferiority and encourage his arrogance. Keep him under a strain and wear him down. When he is united, divide him. Attack where he is unprepared; sally out when he does not expect you. These are the strategist's keys to victory. It is not possible to discuss them beforehand. -- Sun Tzu