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Zone blitz
The zone blitz is one type of "blitz" (i.e., a common method of sudden and intense defensive attack, in American football). It has near-limitless permutations, all sharing a common theme: intentionally confusing the offensive line by having defenders who were initially positioned to rush (blitz) the passer unexpectedly retreat into covering the receivers instead, while simultaneously having one or more defenders who were positioned to "cover" the receivers before gameplay rush the passer by surprise after play commences. As this deception is timed to only reveal itself the split-second ''after'' gameplay commences, the offense is left no time to properly react and adjust. This results, ideally, in player mismatches that leave one or more openings in the offensive line's pass protection, giving the surprise blitzer(s) a clear and quick path to tackling the passer before (s)he has enough time to attempt throwing the football to an "open" receiver (incurring a sack or even a turnover).
==History==
Miami Dolphins defensive coach Bill Arnsparger developed the zone blitz in 1971.〔http://sportsillustrated.cnn.com/vault/article/magazine/MAG1010704/index.htm〕 He started by placing linebackers on the defensive line and having them drop back into coverage, and eventually included regular defensive linemen as well. The scheme did not gain widespread use in professional football until Dick LeBeau refined it with the Cincinnati Bengals and popularized the zone blitz in the early '90s, while coaching the Pittsburgh Steelers, earning Pittsburgh the title of "Blitzburgh". Though the zone blitz has become common throughout the NFL, the 3–4 defense—3 defensive linemen, 4 linebackers—lends itself particularly well to this style of play, and LeBeau continues to utilize it today.〔(- Steelers' LeBeau deserves spot in Hall of Fame )〕
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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