Playbooks
Z Under is a five man route concept out of 10 personnel Pistol Spread that stretches the defense both vertically and horizontally. The two outside receivers run Go routes to clear out the deep coverage while the slot runs a Corner to attack the intermediate hole, and the inside receiver runs a Slant Flat combo underneath as the crossing shallow drag pulls defenders across the field. The HB releases into the flat on the boundary side as a checkdown. This is a man beater at its core thanks to the natural rub created by the shallow crosser, though the two Go routes also hold safeties deep enough to open the Corner route against certain zone shells. Primary read progression starts with the Corner route working from the slot, moves to the shallow Slant Flat crosser if the corner is taken away, and checks down to the HB in the flat as the outlet.
Key the slot corner or nickel defender at the snap, if he sinks with the Corner route the defense is likely playing zone and you should redirect to the shallow crosser. Watch for a user controlled defender sitting in the shallow crossing lane, since that lurk threat is the biggest risk to this concept and will bait quarterbacks into a pick six. Identify two high safeties presnap, which signals Cover 2 or Cover 4 and tells you the Go routes are decoys, forcing you to win underneath with the Slant Flat or HB flat route. Look for man coverage indicators like defenders mirroring receiver motion or aligning in press, since the natural rub from the crossing routes will spring the shallow receiver open against man. Be aware of blitz packages that send extra rushers off the edge, since the HB flat route becomes your fastest answer against a nano blitz or overload pressure look.
Use presnap motion to identify if the defense is in man or zone before the snap, since the shallow crosser is your best indicator against man coverage.
If you see a single high safety, prioritize the Corner route out of the slot since the Go routes will hold the deep defenders and open a soft spot underneath the safety.
Against Cover 2 or Cover 4 shells, work the Slant Flat combo quickly before the underneath zone defenders can sink and cut off the crosser.
This play works best on early downs or third and short since the shallow crosser and flat route give you quick, high percentage completions if the deep shots are covered.
Pair Z Under with Four Verticals or Y Stick from the same formation to keep the defense guessing between quick game and vertical shots without changing your personnel or alignment.




































