Cover 0

How to identify it

• Nobody deep. No high safety at all; every defender is manned up or on the line.
• Defenders crowd the line of scrimmage — more potential rushers than you can block (mid blitz looks, 6+ coming).

Smoke-screen tell:

1. Put an outside WR on a smoke screen.
2. Snap it and watch the corner.
3. If he sprints downhill at the screen instead of backpedaling, he has no deep zone — it's cover 0, and the slot receiver is on a one-on-one island.

Motion tell:

1. Motion a receiver across.
2. A defender chasing him confirms man behind the blitz.