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| | History of Pro Football in Buffalo |
 | | If there was no defender in either of those positions, the tackle would be instructed to cross the line of scrimmage and seal to the inside--that is, take the first defender in front of him or to his left and block him to the left. |
 | | If the defensive tackle began to penetrate quickly, through the area vacated by the onside guard, he could be hit by a quick trap block from the other guard, with the fullback or halfback carrying the ball right up the middle, off a reverse spin by the quarterback. |
 | | Shaughnessy developed the 4-3 over, in which the weakside defensive tackle played over the center, while the strongside tackle and end moved somewhat to the outside, and the 4-3 under, in which the weakside defensive tackle played opposite the center. |
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