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Breakdown
Curl Flats out of Shotgun Normal Y Off (11 personnel) shows a two-man route concept to the left side with the backside receiver running a vertical stem that breaks into a curl at roughly 12 yards, sitting down over the deep third or hole in zone coverage. Underneath that curl, the second receiver runs a quick flat route to the flat area, giving the QB a high-low read against the same defender. The play is a classic zone beater built to attack Cover 3 and Cover 2 flat defenders, and the diagram shows no route drawn from the backfield, so this looks like a max protect or check release concept relying on five or six blockers up front. Primary read progression starts with the curl at depth, then works down to the flat if the underneath defender sinks or the window closes.
Defensive Reads
Watch the flat defender's initial drop; if he sinks to take away the curl, throw the flat immediately before the window closes. Check the deep third defender's depth pre-snap, since a shallow safety alignment suggests Cover 3 and opens up the curl sit at the intermediate level. Beware of Cover 2 with hard-charging corners jumping the flat route, which is the primary defensive answer to this concept and forces the QB to hold the ball longer. Look for a user-controlled linebacker sitting in the curl window, a common lurk technique that baits the QB into an interception if the flat read isn't taken first. Man coverage with no zone drop behind it is the toughest look for this play since both routes lack the separation tools to consistently win one-on-one.
Usage Tips
Use this on second and medium or third and short when the defense is likely to sit in a zone shell rather than blitz. Pre-snap, identify if the corner to the curl side is playing off man or zone; if he bails hard at the snap it signals Cover 3 and the curl sit becomes the primary read. Hot route the flat defender's man into a quick out or drag if you see man coverage with no underneath help, since the flat route alone won't create enough separation against a physical corner. Pair this call with Curls Lead Swing or Curl Combo in your play-calling sequence so the defense can't sit on the same curl-flat read every snap. Against teams that key the curl route with a linebacker spy, motion the flat receiver pre-snap to confirm man versus zone before the snap.
