So, this is one of the plays that I highlighted often as one Lashlee loves. This is called Ace, Smash, Whip from a 2 x 2 set. The QB has a "pre-snap" read on this play where he decides his side of the field based on matchups. Perhaps they're shading a S more to one hash, or perhaps they have a shutdown CB on one side, or perhaps you have a favorite receiver in this concept.
So the QB has already made his decision which side he's going to before the play starts. This is why sometimes you'll hear announcers say things like "he stared it down the whole time." Yes, he did. On purpose. Because he had that side of the field as his read in that play.
From here, he's reading what the boundary CB is doing (the guy covering X or Z). If he drops back in off-coverage, your read #1 goes away immediately. The reason is because he can undercut that corner route if you throw it. This is why I wrote it's really two reads into one because he's reading the CB to determine which option he is taking. If the boundary plays the slant (which is what a Whip looks like before the receiver breaks back outside) then you are taking the corner. The receiver in that situation has to run straight at the S (who will generally be 8-10 yards off the ball against this receiver) and force the S to do what is called a "stem" (stand up out of his backpedal). Once he stems, the receiver goes to the corner. The QB is throwing to a spot in this route, so he can throw it flatter if he needs to, or further towards what would be the back pylon in an end zone throw. It's up the receiver to go get it.
Now, the defense can do some things to combat this, of course, otherwise everyone would just run the play every play. Cover-4 takes away the corner, and then the OLB can do what is called "buzzing the flats" which is immediately sprinting to that flat area and undercutting the Whip route. At that point the QB has to recognize the LB buzzing and go to the checkdown, which is read 3. In that case, the RB is 1-on-1 with a MLB in open space and should win.
A good cover-2 defense can also shade the OLB and "carry" the H or Y receiver 8-10 yards (to get him to the S) and take away the inside. That allows the S to play the corner since the OLB has the inside for the post. At that point the QB has to take the Whip if it's open, or the checkdown. It still gets your RB on a MLB in open space and you should win that more than not.
A final wrinkle that the offense can do is to run an RPO and if you get that MLB on the RB, he becomes a lead blocker against the MLB and you have the QB running with a lead and a numbers advantage in the box. It's a play I love, but didn't see when Lashlee was at SMU.
If you run this out of Trips, your Pre-Snap read is not which side of the field, but whether or not you are going to throw to the single WR side. If not, that route becomes a decoy and is no longer part of your reads Post-Snap.
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This play is called Ace Z Levels. Again out of 2 x 2. Again, the QB has a Pre-Snap read to determine where he is going to go with the ball. If he has the right coverage (single-high S) or press coverage with a shade S to the opposite hash, this is an automatic throw to the X. You take your deep shots generally determined prior to the ball being snapped in this offense.
Once the ball is snapped for this play, the offense is attacking short, medium, deep (which is why it's called "Levels"). For this play, the first read is the shallow cross from the Z receiver. The QB takes a 5-step drop and his eyes go to the flat defender on the left side (since that's where the shallow is headed). If the flat defender is buzzing, dropping, or just covering, the QB goes to read 2. The Dig route. The Dig route is a very important route in the Air-Raid offense and is one the receiver has to run full speed because it's timing for two different windows. The first window is the left side of the MLB. The second window is on the other side of the MLB as the receiver keeps running. The QB would need to be sure he has time to get to that second window rather than going to his third read.
The QB would not get to that third read unless he sees the S coming down to take away the Dig route. If he comes down to take away the Dig, then the QB knows he has the Post and it's what you dream of.
If the QB doesn't have any of those routes he will come down to the checkdown, which is read 4 on this play. Need a good OL to run this play, but Peyton Manning has called this play and "Layers" his favorite routes because it stretches the defense to cover every inch of the field.
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This is called Ace Mesh. This play gets its name because the two crossers create a "mesh" point where they mesh together in their routes. The defense calls it a pick play, of course.
The Pre-Snap read is again which side of the field the QB sees the better matchup on. His first read is that corner route again. Air-Raid offense love to attack the corner route because it is difficult for defenses to stop. Same situation, where if it is covered the QB comes down to read 2, which is the mesh point. You're just looking to see which one gets separation from the mesh.
In this picture the 3rd read is the swing pass. You saw a gif of this play in my write-up. Only there, the edge defender jumped the swing pass and the RB turned it into a wheel, which is awesome. The play can be designed to be a swing pass, or a wheel route.
Additionally, if the QB loves the matchup of the RB on whichever edge defender is out there, he can make that his "Pre-Snap" read and just wait for the other routes to clear it out for him and hit the wheel.
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This is Ace Sprint with Smash. You can do different things with your Z receiver in this route, this is a hitch which must be run to the sideline to keep spacing for your Y to run his corner route. The QB is just reading the boundary CB again on this play. The picture is more simple than what Lashlee runs because he likes for that H to run a Dig route and get across the QB's vision if he needs to throw back to hit a receiver. You saw a couple of stills of this play in my write-up where the QB missed the H on one and hit him on another.
This is one of the plays in the playbook where the RB is designed to block on the play.
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Last one I'll do real quick, this is called Trips left Comebacks. The Pre-Snap read for the QB on this play is the Safety or Safeties. If they have a single-high S, you read the middle seam as your 1st read. If it is any other coverage Pre-Snap, you are reading your Deep Comeback as your 1st read. Most QB's don't have the ability to read both Comebacks, and will come off of it after the first one and move to the seam or middle seam.
After that, the last option is checkdown or scramble.
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I hope this helped explain a little bit more about what I was trying to say in my initial article
@Empirical Cane