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5–2 defense
In American football, the 5–2 defense is a defensive alignment consisting of five down linemen and two linebackers.
== 5-2 Eagle ==
Historically, there are two significant variations of the 5–2 defense in professional and college football. The first is the defense created by Earle (Greasy) Neale.〔Didinger, Ray and Lyons, Robert S. ''The Eagles Encyclopedia'', Temple University Press, 2005, p. 101.〕 This defense was prominent in the National Football League from the late 1940s through the middle 1950s and was a precursor defense to Buddy Ryan's 46 defense.〔Ryan and Walker, p. 10.〕 Paul Brown describes the defense as having a tight five man line, and linebackers who were to jam offensive ends as they came off the line.〔Brown, Paul and Clary, Jack, ''PB: The Paul Brown Story'', Atheneum, 1979, p. 197.〕 Brown goes on to say that the use of four defensive backs was innovative at the time. By 1950, the base defense of NFL teams were five man line defenses, either the 5-2 Eagle or the 5-3-3.〔Carroll et al. p. 465.〕
The 5-2 Eagle has a (passing) hole in the middle of the defense, usually dealt with by having outside linebackers jam the ends. Offenses countered by using slot backs instead of tight ends.〔Rand, p. 36.〕 Consequently, teams began to experiment, around 1954, with pulling the middle guard back a couple yards and putting him in a 2 point stance. The success of the New York Giants in 1956 with their base 4-3 lead to a rapid conversion to the 4-3 in 1957. Almost all teams switched to the new defense at that time.〔Zimmerman, p. 128〕
Note that in this defense, if you pull the middle guard and replace him with a middle linebacker, you get to an early version of the 4-3 defense.〔Zimmerman, p 128.〕 Conversely, if you take a 4-3 defense and replace the middle linebacker with a middle guard, then you convert a 4-3 into a 5-2 Eagle. This latter switch is historically significant in at least one game. In 1972, George Allen pulled his middle linebacker, replacing him with defensive lineman Manny Sistrunk, defeating Green Bay in a playoff game with his unexpected five man front, shutting down the Packers' powerful rushing combination of John Brockington and MacArthur Lane.〔Richman, Michael, ''The Redskins Encyclopedia'', Temple University Press, 2008, pp. 87-89.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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