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cornerback
A cornerback (CB) (also referred to as a corner) is a member of the defensive backfield or secondary in American and Canadian football.〔(A Brief History of the Game. )〕 Cornerbacks cover receivers, to defend against pass offenses and make tackles. Other members of the defensive backfield include the safeties and occasionally linebackers. The cornerback position requires speed and agility. A cornerback's skillset typically requires proficiency in anticipating the quarterback, back-pedalling, executing single and zone coverage, disrupting pass routes, block shedding, and tackling. Cornerbacks are among the fastest players on the field.
== Overview ==
The chief responsibility of the cornerback is to defend against the offense's pass. The rules of American professional football and American college football do not mandate starting position, movement, or coverage zones for any member of the defense.〔 〕 There are no "illegal defense" formations. Cornerbacks can be anywhere on the defensive side of the line of scrimmage at the start of play, although their proximity, formations, and strategies are outlined by the coaching staff or captain.
Most modern National Football League defensive formations use four defensive backs (two safeties and two corners); Canadian Football League defenses generally use five defensive backs (one safety, two defensive halfbacks, and two corners). A cornerback's responsibilities vary depending on how the defense assigns protection to its defensive secondary. In terms of defending the run, often corners may be assigned to blitz depending on the coaching decisions in a game. In terms of defending passing plays, a corner will be typically assigned to either zone or man-to-man coverage.
The most effective cornerbacks are typically called "shutdown corners," because they can cover an offensive receiver so effectively, on either side of the field, that the quarterback doesn't bother to throw towards (or target) the receiver being covered by a "shutdown corner" any longer. A "shutdown corner" is most often used to identify a cornerback that "lines up" on either side of the defensive zone of the field of play. This term, "shutdown corner", is typically used to refer to only an elite few players in the game of American Football.
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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