Strategic Deception

Deception in Sun Tzu is not a supplementary technique but the bedrock principle from which all tactics are derived. If the enemy cannot accurately read your strength, position, or intentions, his preparations will be misaligned, his forces dispersed, and his timing wrong. The deceiving army therefore fights as if choosing the terms of every engagement, because the opponent is always responding to a fiction.

Sun Tzu extends the principle into a set of operational inversions. Strength must be projected as weakness to invite the enemy's advance; weakness must be projected as strength to deter him. Near must appear far to make him relax; far must appear near to keep him anxious. The purpose is not confusion for its own sake but the systematic manufacture of an enemy who is always in the wrong posture — advancing when he should be waiting, waiting when he should be advancing.

The corollary is that the commander's own plans must be perfectly concealed — not only from the enemy but even from his own troops until the moment of execution. In Chapter VI Sun Tzu warns that tactics which succeeded once must not be repeated, because the enemy will have learned to expect them. Deception is not a fixed trick but a continuous posture of strategic opacity.

The deception maxims are concentrated in Chapter I, §§ 18–24, "Laying Plans," with elaborations in Chapter VI on weak points and strategic positioning.