Playbooks
China Under is a trips based passing concept out of Singleback Y Off Trips that combines an under route with a deep dig or crosser to attack the middle of the field, functioning primarily as a man beater against man coverage while also giving you answers versus zone drops. The trips side creates natural rub potential to shake press man defenders, while the backside typically holds a vertical or comeback to keep the safety honest. Your primary read progression starts with the under route working from trips into the middle void, then moves to the deep crosser if a linebacker or safety squats on the shallow route, with the backside vertical as your alert versus single high or blown coverage.
Identify the middle linebacker depth pre-snap, since shallow linebacker alignment signals they will jump the under route and you should progress immediately to the deep crosser. Watch for safety rotation post-snap, if both safeties bail deep into a two high shell the under route sits in a soft window, but if one safety cheats down expect a robber or lurk defender sitting in that same throwing lane. Key the cornerback technique on the trips side before the snap, tight press alignment tells you the rub concept will spring the under route open almost immediately off the line. Recognize man coverage indicators like defenders turning their hips and running with receivers stride for stride, this confirms China Under is the right call since the traffic in the trips bunch disrupts man leverage. Look for a blitz package with an extra rusher off the edge, if the offensive line shows a protection issue you need to get the ball out on the under route quickly instead of waiting for the deep crosser to develop.
Check the middle of the field pre-snap to identify single high versus two high shells, since China Under thrives against man coverage and single high looks where the under route can settle into the vacated zone.
If you see press man across the trips bunch, trust the natural rub and layer your throw to the under route as soon as your quarterback hits the top of his drop.
Hot route the backside receiver into a quick out or speed out against aggressive corners playing off man, this gives you a faster answer if the under route is jumped by a lurking linebacker.
Use this play on second and medium or third and short situations where the defense expects run or a quick game concept, since the under route develops fast enough to beat blitz pressure.
Pair this call with Se Curl or Slants earlier in a series to condition the defense into expecting quick throws, then hit China Under to hit the intermediate crosser once linebackers start jumping short routes.