Playbooks

X Under is a play-action flood concept out of Shotgun Trips TE Offset that overloads one side of the field with five route combinations. From the trips side you get a go route, a corner route, and a flat route stacked vertically to horizontally, while the offset TE runs a drag underneath and the backside X receiver runs a slant off the play-action fake. The primary read progression starts with the flat route as the quick underneath option, then works up to the drag crossing the field, and finally to the corner or go route if a defender bites on the shallow stuff, making this a strong Cover 3 beater and man beater depending on the leverage you get post-snap.
Identify single high safety alignment pre-snap, since that tips a Cover 3 shell that this flood concept is designed to exploit. Watch the flat defender closely, if he sinks with the drag route or widens too far, the underneath flat throw becomes an easy pitch and catch. Key on the corner route defender post-snap, because if a linebacker or slot corner tries to rob the drag, the corner route will sit in the window behind him for a big play. Man coverage with no safety help over the trips side is vulnerable to the go route beating a corner on an outside release. Watch for user blitzes off the edge on the play-action fake, since the deeper drops on this concept take extra time to develop and can get the quarterback hit if protection breaks down against a nano blitz look.
Check the defensive alignment pre-snap for single high safety looks, since this play is built to punish Cover 3 zones with the flood concept on the trips side. If you see man coverage with no safety help over the top, hot route the go route to a slant or peek the backside slant for a quick answer against blitz looks. Use this play on early downs to stay ahead of the count, then come back to RPO Alert Bubble or RPO Zone Alert Bubble from the same set to keep the defense guessing on run fits versus pass drops. Against Cover 3 defenders sitting on the drag, progress to the corner route sitting behind them for an explosive gain. Pair this with Verticals or Flood later in the game once defenders start jumping the drag and flat routes, since the shell will look identical pre-snap but attack deeper zones instead.

















