This is very basic and not an exact science in terms of the illustrations. But the explanations
are sound. No way to cover much...there are slants, movements, games, stunts, tons of stuff
within all of these. And in some calls an assignment may change
But there is a little bit of confusion about this with a couple of folks around here.
And this does not even cover much nickel fronts (Rams now usually are a 4-2-5 in essence though their DEs stand up)
So, again, just a starting point for discussion not plenary.
++++++++++++++++++
This is 2-gap, old school, not played these days, really--though you never say never when it comes
to what coaches will do.
Think of Fritz Shumur's 3-4, Or Belichick's or others back in the day
2-gap is 1-gap once the DL sees the flow of the play.
They strike the OL opposite them, and read the blocking patterns and RBs their "keys"
In this case the flow is to the defense's right.
So, the left DE, the head-up 4-tech, strikes plays the B-gap--to his right, the way the flow went
the nose tackle strikes and plays the playside A-gap
the right 4-tech strikes and plays the C-gap.
if the flow were to the defenses left
the the LDE, 4-tech, plays the playside C-gap
the NT plays the playside A-Gap
the RDE plays the backside B-gap.
They play ONE gap a split second after they know where play is going
The Sam and Will do usual things...set edge playside, CBR backside.
Lbers flow to ball, take any inside gap that is threatened or of run is outside
fill in and flow
NOW---there are exceptions. There can be a slant call where there is no reading
it's pure 1-gap. Just because you play a 3-4 as your base, even old-school 2-gap
does not mean you have to play it the same way every time.
Even in Shurmur's day they would not be in 2-gap every time. it could be all three
in 2-gap. 2 of the three DL or 1 in 2-gap or none.
________________
This is what Rams did under say, Phillips or other 3-4 one 1-gap teams.
it's the same as a 4-3 except the personnel is different. But it is more flexible
and out of this you can do a lot. You can see gap assignments in this example
Rams do this NOW as well. Not in the 5-1, but in the 3-4. They have, if I understand it, Gap-½
concept at times. They are getting penetration, one gap, but not going as deep as in gap control or
a 4-3 1-gap that has some overflow.
In the Rams 3-4 under Phillips and now, the NT is not a zero tech, he's shaded one side or the other.
____________________
This is a Schwartz-type Gap control. One man per gap. Uses a DE wide... in a 9-tech
_________________________
This is more of a Fisher 1-gap. Almost everyone has 1 gap but they don't
leverage every gap. There is overlap and some reading by the off-ball linebackers.
it's still one gap but not PURE gap control. there is a difference. There can be a 2-gap
on the backside, away from the play in some calls... just so they don't waste a guy in a "mythical gap"
one that disappears after the snap.
The DE is often a 5-tech and the SAM is the 9-tech. But it can vary
______________________
This is the Staley/Fangio Penny front. Rams use it maybe 20%-25% of the time depending on game. The NT plays one gap based on the call. Sometimes it's toward the play, other times it's away. Sometimes it's a two-way go, his choice. He takes his gap and squeezes/helps/overlaps the gap next to him.
The 4is (DTs or DEs, whatever you want to call them---I call them DTs but Fanio says ends) they have the B=gap and squeeze to overlap and help the NT.
the Sam and Will contain --backside watches for cutbacks, reverses, boots---standard stuff
The one LBer flows to the play, the safety to the side of the flow comes down. The CB forces if he's not run off.
This is one way to illustrate Gap-½, though not perfect--if the NT were called to backside he's take other A-gap and squeeze. It's about overlaps. 6 guys taking the gaps that take 7 in other fronts (including LBers)
Looking at this, could have done better job drawing it.. but oh well.