Playbooks
Dbls Flex Y Off Close is a 2x2 Doubles look out of Shotgun using 11 personnel, with the Y tight end aligned off the line of scrimmage in a close flex position just outside the tackle. The other Doubles sets in Shotgun either put the TE on the ball as an inline blocker or split him wide as a pure receiver. This alignment keeps the Y in a hybrid H back role, so he can climb to the second level as a lead or wham blocker, or release clean into the flat and seam without having to fight a jam at the line. The two slot and outside receivers on each side give you balanced width, which forces defenses to declare their coverage shell before the snap.
The set is built around Mtn concepts (Mtn Dig Under, Mtn Angle Y Wheel, Mtn Dagger Y In, Mtn Switch Corner, Mtn Slot Post) that layer vertical and intermediate routes over the TE and RB underneath. The off ball Y is the key chess piece. Linebackers have to respect him as a blocker on Inside Zone, Mid Zone, and Counter Y, which opens windows behind them for Y Stick, Y-sail, and the Y In on Mtn Dagger Y In. The jet motion family (Zone Fake Jet 1, PA Zone Fk Jet 1, Jet Pass Fk Zone 1) adds horizontal stress and eye candy that pulls flat defenders and safeties out of position.
From a matchup standpoint, the close alignment lets you isolate the Y on a linebacker or strong safety in man coverage, especially on the Angle and Wheel concepts where he gets a free release. A 3DRB or Power HB gets full value here thanks to Mtn HB Out, Mtn HB Angle, Mtn HB Fade, Mtn HB Slot Screen, and HB Pump Draw, while an SLWR in the slot feasts on the Slot Post and Dig Under combos against off coverage and zone voids.
Count the box pre snap: six or fewer defenders means hand off on Inside Zone or Counter Y, while seven or more means go to RPO Zone Peek Glance or a Mtn pass concept
On 3rd and short, run Y Stick or Mtn HB Out and hot route the backside slot to a slant, giving you a quick man and zone beater combo on the same side
Use jet motion on Zone Fake Jet 1 to diagnose coverage; if a defender runs with the motion it is likely man, so check to Mtn Angle Y Wheel or Mtn Switch Corner
Against Cover 2 in the redzone, call Redzone Scissors or Mtn HB Fade and put the SLWR on a corner route to attack the hole between the flat and safety
When facing heavy blitz tendencies, audible to Mtn HB Slot Screen or HB Pump Draw to punish aggressive rushers, then block the RB or Y to buy time on your deep shots