Originally posted by wu-dai clan
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Fist is the 43 vs 34 over under thing. The middle upper figure shows the classic 43 D. The middle lower the classic 34 D. So in the 43, there are 4 DL covering the 5 OL, and the LB are out in space. In the 34 there are only 3 big guys, so there is more space for the OL to block the LB behind.
To the left and the right are the "adjustments" from the regular alignment. In the 43 you move the DT "over" to the strong side, or "under" to the weak side. In the 34 you are shifting the DE on the TE side (Strong side) over to the NT, and the 34 "under" shift is you shift the under DT closer to the NT.
In the right (under) side, the DT are both over the C an LG. In the under 34 the DE and NT are over the LG and C. If the Will LB is strictly a pass rusher, then there the 34 and 43 under are the same defense. You call the positions something different, they are the same assignments.
Same thing with the 43 and 34 over. The big DL cover up the RG and C. So the 34 and 43 Over are the same defense, or at least the assignments are the same.
These formations are nothing new, NFL teams have been using over and under shifts since about 1960's. And they didn't call it a 34 Defense back then, it was called a 52 defense, but it is exactly the same as I drew it up (End, tackle Nose guard, tackle, end) with 2 LB behind them. Nothing has changed in defenses since Tom Landry (DC Giants) and Steve Owens played a 6-1 defense (just 2 of Owens DE became LB instead of DL).
Personnel dictionary
34 position ...........................43 position
W- Will LB..........................E - Weak side DE
E - End .............................. E or T
N - Nose Tackle ....................always plays T
E - End .............................. E or T
S - Sam LB .......................... Sam LB
M - Mike LB .......................... Will LB
Ma - Mack LB ....................... Mike LB
look at the Nickle defenses, the primary defense of the NFL
nickel D.png
nickel D is about the same thing. The shaded circles are the guys who typically come off the field. 34 teams take their NT off the field, and move a new DB on the field ($) and the 43 team takes one of their LB now a SS/nickel DB aligns wider than the 43 SAM LB did, but it is the same assignments.
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