Curl-Flat
The fundamental conflict read on the flat defender
- Read #1
- Reads 2+
- Checkdown
- Telestrator
The outside receiver runs a 12-15 yard curl while the inside receiver releases to the flat. The curl/flat defender is the conflict player, he cannot cover a 12-yard curl and a flat route simultaneously. The QB reads this single defender and throws opposite his movement. Bill Walsh invented and systematized this as part of his West Coast Offense with the Cincinnati Bengals (1968-75). Joe Montana and Steve Young executed it masterfully with Jerry Rice and Roger Craig.
Reads
5 ROUTESTap a route to trace it on the field.
Read progression
Read the curl/flat defender. If he drops to cover the curl, throw the flat. If he drives on the flat, hit the curl sitting behind him.
Why it works
The curl/flat defender faces an impossible choice, he cannot cover both a 12-yard curl and a flat route simultaneously. The QB reads one defender and throws opposite his movement.
Conflict defender
The curl/flat defender, he cannot cover a 12-yard curl and a flat route simultaneously
Origin
Bill Walsh invented and systematized this as part of his West Coast Offense with the Cincinnati Bengals (1968-75). Joe Montana and Steve Young executed it masterfully with Jerry Rice.
Curl-Flat vs coverages
12 RATED- Cover 3Beats it
The curl sits at 12 yards behind a curl/flat defender who has to widen with the flat; whichever route he takes, the other is thrown on rhythm.Show reasoning
Conflict defender. Curl/flat defender (WILL)
Why the offense wins. The curl sits at 12 yards behind a curl/flat defender who has to widen with the flat; whichever route he takes, the other is thrown on rhythm.
Why the defense wins. If the hook linebacker gets width to wall the curl, the curl/flat defender can stay shallow on the flat, but that wall has to win every snap for the coverage to hold up.
Key adjustment. Have the hook linebacker get width to wall the curl so the curl/flat defender can stay on the flat.
- Cover 4Edge
Quarters has only 3 underneath defenders for 5 zones.Show reasoning
Conflict defender. Curl/flat defender (WILL)
Why the offense wins. Quarters has only 3 underneath defenders for 5 zones. The bail-technique CB gives the curl a big cushion, and the flat outflanks the WILL expanding from the box; thrown on rhythm, the ball beats the safety's late help on the curl.
Why the defense wins. The quarters safety reads #2 to the flat and drives down on the curl, and the corner squats once #1 breaks it off, so the window closes if the throw is late.
Key adjustment. Spin a safety to robber the curl, or move to a palms/Cov 6 look to add an underneath defender.
- Cover 1Toss-up
Press man can disrupt the curl timing; no zone conflict to exploit.Show reasoning
Conflict defender. Cornerback in man coverage
Why the offense wins. The curl can sit in open grass against off-man coverage.
Why the defense wins. Press man can disrupt the curl timing; no zone conflict to exploit.
Key adjustment. Press the curl runner and let the man defender on the flat run it down; there is no zone defender to read.
- Cover 2Toss-up
The squat CB takes away the flat while the hook LB walls the curl with the half safety capping over the top; Cover 2 puts two underneath defenders plus deep help on the two-route stretch.Show reasoning
Conflict defender. Cornerback (flat zone)
Why the offense wins. The squat corner has to honor the flat, and the curl sits at 12 yards behind him in front of the half safety; if the hook linebacker is slow to widen, the curl is open.
Why the defense wins. The squat CB takes away the flat while the hook LB walls the curl with the half safety capping over the top; Cover 2 puts two underneath defenders plus deep help on the two-route stretch.
Key adjustment. Have the corner squat on the flat and the hook linebacker wall the curl; the half safety caps it.
- Cover 6Toss-up
Cover 6 has 4 underneath defenders, the curl-flat triangle is split between zones.Show reasoning
Conflict defender. Curl/flat defender (WILL, quarters side)
Why the offense wins. The curl can sit if the WILL widens with the flat.
Why the defense wins. Cover 6 has 4 underneath defenders, the curl-flat triangle is split between zones.
Key adjustment. Have the quarters safety drive the curl once #2 shows flat; the corner squats on it.
- RobberToss-up
The curl can be capped by the robber on a wide curl break.Show reasoning
Conflict defender. Corner in man on the curl
Why the offense wins. The flat stays outside the robber.
Why the defense wins. The curl can be capped by the robber on a wide curl break.
Key adjustment. Keep the robber at curl depth to help the corner; the man defender on the flat runs it down.
- Cover 3 CloudToss-up
The squat corner takes the flat and the rotated safety sits on the curl from depth, so the read plays like Cover 2 to that side.Show reasoning
Conflict defender. Cloud corner (flat)
Why the offense wins. The cloud corner squats the flat, so the curl at 12 yards sits behind him in front of the rotated safety; if the hook linebacker is slow to widen, the curl is open.
Why the defense wins. The squat corner takes the flat and the rotated safety sits on the curl from depth, so the read plays like Cover 2 to that side.
Key adjustment. Have the cloud corner take the flat and the hook linebacker wall the curl; the rotated safety caps it.
- Quarters StubbieToss-up
Stubbie plays the curl/flat like Cover 2: the corner squats the curl, the WILL takes the flat and the safety is over the top.Show reasoning
Conflict defender. Squat corner on #1
Why the offense wins. The corner squats on the curl, so the flat is open until the WILL widens, and the curl can still sit behind the corner if he drives on the flat.
Why the defense wins. Stubbie plays the curl/flat like Cover 2: the corner squats the curl, the WILL takes the flat and the safety is over the top.
Key adjustment. Squat the corner on the curl and have the WILL run the flat down.
- Cover 0Tough
Man coverage takes both receivers individually with no underneath zone defender to put in conflict, the concept's entire purpose disappears.Show reasoning
Conflict defender. Man-coverage CB
Why the defense wins. Man coverage takes both receivers individually with no underneath zone defender to put in conflict, the concept's entire purpose disappears.
Key adjustment. Match both receivers man-for-man and bring the pressure.
- Tampa 2Tough
Tampa 2 (and Cover 2) is purpose-built to defend the curl-flat read, the flat defender drops with the curl while the CB squats on the flat, with safety help over the top.Show reasoning
Conflict defender. Curl-flat zone defender (WILL)
Why the defense wins. Tampa 2 (and Cover 2) is purpose-built to defend the curl-flat read, the flat defender drops with the curl while the CB squats on the flat, with safety help over the top.
Key adjustment. Have the WILL drop with the curl while the corner squats on the flat.
- Cover 2 ManTough
Man under takes away the curl-flat conflict, every receiver has his own assignment and no defender is in a high-low bind.Show reasoning
Conflict defender. Slot defender in man
Why the defense wins. Man under takes away the curl-flat conflict, every receiver has his own assignment and no defender is in a high-low bind.
Key adjustment. Match both receivers man-for-man under the two deep safeties.
- Palms / ClampTough
#2 to the flat is the exact Palms trigger — the corner traps the flat for a pick threat while the safety drives the curl from depth.Show reasoning
Conflict defender. Curl/flat defender (WILL)
Why the offense wins. The curl can hit on rhythm before the safety drives down, and a QB who identifies trap technique can hold the corner with his eyes.
Why the defense wins. #2 to the flat is the exact Palms trigger — the corner traps the flat for a pick threat while the safety drives the curl from depth. Both routes of the triangle are baited.
Key adjustment. Have the corner trap the flat off his #2 read and the safety drive the curl from depth.