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Salem Pivot from Shotgun Stack Y-Flex is a pass concept built around a pivot route on the right side, where the inside receiver breaks outside then snaps back inside on a deep in before turning back to the sideline, while the outside receiver on that side runs a shallow drag across the field. On the left side, the stacked receivers run a deep corner-post combo up top and an out route underneath. This is primarily a man beater, since the pivot route is designed to create separation through the double move, but the shallow drag and out route also give you answers versus zone drops. Primary read progression starts with the pivot route to see if the defender bites on the initial break, then works to the deep post shot on the backside, and checks down to the drag or out route if both are covered.
Watch for a cornerback playing outside leverage in man coverage, since he is the primary defender the pivot route is designed to defeat with the double move. Identify single high safety shells before the snap, because the backside corner-post combo can attack a rotating safety who has to cover both verticals. Key on linebacker depth at the snap, since a shallow drop by the middle linebacker can jump the drag route and blow up your checkdown option. Watch for user-controlled defenders sitting on the pivot break, as smart human defenders will often bait the initial move and stay square to jump the route once it turns back inside. Zone coverage with a hard flat defender can undercut the underlying out route, so recognize cover 3 or cover 4 shells that keep a defender sitting in that flat zone before committing to that read.
Look for man coverage indicators pre-snap like tight press alignment on the pivot receiver, since the double move is designed to snap ankles on man defenders who overcommit to the first break.
Use the pivot route as your first read on third and medium situations where you need a defender to bite hard before he snaps back inside for the completion.
If you see two deep safeties pre-snap, prioritize the backside post shot since the corner route can stress a single high safety rotating late.
Motion or check the drag route into a hot route adjustment versus blitz looks, since it clears out quickly and gives you a hot outlet against pressure.
Pair this play with HB Draw or Inside Zone earlier in a series to slow down linebacker flow, then come back to Salem Pivot once the defense starts keying run and sells out on the ground game.