Playbooks
Mtn Buck Sweep(y Stops) is a run play out of Shotgun with a jet or orbit motion that stresses the edge before the snap, forcing the defense to declare its run fits early. The Y receiver runs a stop route as a built-in check option if the sweep look draws a hard fill from a linebacker or slot corner, giving this play a light RPO flavor even though it is designed primarily as a perimeter run. The primary read progression starts with the motion defender: if he chases across the formation or bites hard inside, pull the ball and attack the sweep edge, and if the Y stop route is uncovered against a soft flow defender, that is your bailout throw.
Watch the flow of the second level linebackers immediately after the snap, if they flow hard with the sweep motion and vacate the middle, that opens the Y stop as a window against man or zone alike. Key the play side defensive end and outside linebacker leverage before the snap, if they are lined up wide with contain responsibility this sweep will struggle to get outside and you should be ready to bail into the stop route earlier. Look for slot corners or nickel defenders sitting in shallow zone drops, they are the primary defender the Y stop route is designed to beat since they often peek into the run fit and lose coverage discipline. This play struggles against Cover 3 Sky or Cover 4 shells with disciplined force defenders who stay home on the edge, since the extra run support defender can erase the sweep lane before it develops. Beware of user-controlled linebackers spying the backfield or sitting in a lurk technique underneath, aggressive human defenders who diagnose sweep motion quickly can blow this play up at the mesh point or jump the Y stop route for a big turnover opportunity.
Use the pre-snap motion to identify man versus zone before the snap, if a defender follows the motion man across the formation you are almost certainly facing man coverage and the sweep lane on the backside will be softer.
Hot route the Y stop into a quick out or keep it as is against teams that sit their linebackers short, since the stop route is your answer versus aggressive edge defenders who key run fast.
Best used on early downs (1st and 10, 2nd and short) to keep defenses honest, then pair it later in a series with Mtn HB Counter or HB Off Tackle so the defense cannot sit on outside zone flow.
Combine with Mtn Buck Sweep from the base playbook and RPO Peek Slant in the same drive to condition the defense to respect both perimeter run action and quick game, opening up play-action shots like PA Dagger or PA Read later.
Avoid calling this into stacked box looks with numbers advantage for the defense unless you are confident in your ability to option off the Y stop, since the edge blockers can get overwhelmed against extra defenders near the line.