Stratagem 22: Shut the Door to Catch the Thief

The Stratagem

關門捉賊 — “Close the door to catch the thief.”

The core idea is simple: once a threat is inside a space you can control, close the exits and deal with it there.

Why Containment Matters

If you chase a thief everywhere, they keep the advantage of movement. If you contain them, their options collapse.

This is why the stratagem is about concentration, not spectacle.

The Strategic Logic

1. Let the threat enter a controllable space
2. Seal the exits once the position is clear
3. Prevent dispersal and side escape
4. Resolve the problem decisively while it is enclosed

Modern Application

• Security: isolate the breach instead of chasing every symptom
• Business: contain a problem unit before it infects the larger system
• Negotiation: narrow the issue so the other side cannot keep shifting ground

Warning

Containment only works if the space is truly yours to control. If you close too early or without sufficient strength, you may trap yourself with the threat.

Key Takeaways

• Containment is often stronger than pursuit
• Closing exits reduces an enemy’s room to maneuver
• The stratagem is about concentration, not drama
• Enclosure works only when you truly control the space

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Next: Stratagem 23 — Befriend the Distant, Attack the Near →