Playbooks

Y Cross out of Shotgun Split Slot Open sends the backside outside receiver on a deep vertical cut to the corner while the Y (tight end or inline slot) runs the namesake crossing route from right to left, working underneath the deep route and settling in the middle void. The right side receiver runs a quick out breaking to the sideline, and the running back releases on an angle route from the backfield into the flat opposite the crosser, giving you a five man route concept built to stretch zone coverage horizontally and vertically. This is a zone beater first and man beater second: the primary read is the Y crosser working from the strong side toward the opening created by the vertical route, with the HB angle route as the checkdown if the middle is congested.
Pre-snap, identify single high versus two high safety alignment since two high shells leave more room for the Y crosser to settle underneath. Watch linebacker depth at the snap, if they sink deep into zone drops the crosser will have room, but if they stay shallow they can undercut the route. Man coverage with press technique on the outside receivers is the biggest threat to this concept since the crosser has no natural pick or rub to create separation. Look for a user controlled defender sitting in the shallow middle zone, known as a lurk defender, since this is exactly the spot the Y crosser is designed to attack. Blitz packages that bring extra rushers off the edge can disrupt the timing of the crosser before it fully develops, so check protection or use the HB angle route as a quick outlet against pressure.
Use this against defenses showing two high shells since the crosser will settle into the void behind linebackers and in front of deep safeties.
Hot route the vertical route into a deep comeback if you see press man coverage, since the crosser alone can struggle to separate against tight man technique.
Attack this on second and medium or third and long when defenses are more likely to sit in zone drops instead of blitzing.
Pair this play with Backs Cross or Mesh in the same set so the defense has to respect multiple crossing concepts and cannot key the Y crosser every snap.
If the user drops a linebacker to spy the crosser, check down to the HB angle route immediately instead of forcing the ball into a covered lane.