虚实
Impose your will on the enemy instead of accepting theirs; be first to the field and rested. Like water, avoid their strength and strike their emptiness — and keep no fixed shape.
What this chapter says
This is one of the most admired chapters, on 虚 (emptiness/weakness) and 实 (fullness/strength). The commander who reaches the field first and awaits the enemy is fresh; the one who arrives late and rushes to fight is worn out. So the skilled leader imposes his will on the enemy and does not let the enemy's will be imposed on him — luring, forcing, and tiring the opponent while staying in control. He concentrates his own force while dispersing the enemy's, so he is always strong where they are weak. Military tactics are like water: as water avoids heights and rushes to low ground, so an army avoids the enemy's strength and strikes his emptiness. And as water shapes its course to the terrain, the soldier shapes his victory to the enemy — 'there are no constant conditions': formlessness is the height of skill.
Key lines
Applied today
Compete where you're strong and the rival is thin, never head-on against their fortress. Set the terms so they react to you — and keep your strategy adaptable, with no rigid playbook a competitor can predict.
Arrive prepared and rested while the other side is rushed and reactive; concentrate your case on their weakest point rather than trading blows on their strongest, and never lock into a fixed position they can plan around.