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Quick Reference
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Breakdown
Duo out of Singleback Bunch Ace 12 personnel is a downhill power run play designed to double team the interior defensive line at the point of attack before climbing to the second level. The diagram shows the HB taking a slight angle toward the strong side, reading a single lead blocker path with the offensive line covering gap responsibilities up front while the bunch receivers hold their stems to occupy the second level defenders. This is a run play with no route combos to read, so the primary progression is the HB pressing the hole, reading the double team blocks up front, and cutting off the play side double team to whichever crease opens between the tackle and guard.
Defensive Reads
Key the Mike linebacker pre-snap, if he is stacked tight behind the double team gap expect a quick fill and less cutback room. Watch for a 4-3 under or heavy front with extra bodies in the box, this is the look that shuts Duo down since it removes the double team leverage advantage. Post-snap, track whether the play side defensive tackle gets moved off the double team, if he holds ground the HB has to bounce outside instead of hitting the called gap. Look for user-controlled linebackers flowing hard downhill on contact, aggressive human defenders sitting on run gaps are the biggest threat to Duo hitting for positive yardage. Check safety depth before the snap, a single high safety with the corners playing off suggests base run support and a green light to run Duo, while two deep safeties often means lighter boxes and more room to operate.
Usage Tips
Run Duo against base fronts with light boxes, ideally six or fewer defenders in the box, since the double team blocks need numbers advantage to work.
Use pre-snap motion or a quick glance at the Mike linebacker depth to confirm run support is not stacked, since Duo struggles versus heavy blitz looks that fill gaps fast.
Hot route the bunch TEs into stalk blocks if you see edge defenders crashing hard, this reinforces the perimeter and keeps the cutback lane alive.
Pair Duo with Inside Zone Split and Counter Y from this same Bunch Ae set to keep linebackers guessing between zone stretch, gap counter action, and this power double team scheme.
Best called on early downs, especially 1st and 10 or 2nd and short, when defenses are more likely to sit in base personnel rather than sub in extra DBs.
