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Safety (gridiron football position)
Safety (S) is a position in American and Canadian football, played by a member of the defense. The safeties are defensive backs who line up from ten to fifteen yards in front of the line of scrimmage. There are two variations of the position in a typical American formation, the free safety (FS) and the strong safety (SS). Their duties depend on the defensive scheme. The defensive responsibilities of the safety and cornerback usually involve pass coverage towards the middle and sidelines of the field, respectively. While American (11-player) formations generally use two safeties, Canadian (12-player) formations generally have one safety and two defensive halfbacks, a position not used in the American game.
As professional and college football have become more focused on the passing game, safeties have become more involved in covering the eligible pass receivers.
Safeties are the last line of defense, and are thus expected to be sure tacklers. Indeed, many safeties rank among the hardest hitters in football history.
==Free safety==
The free safety tends to watch the play unfold and follow the ball. The free safety is typically assigned to the quarterback in man coverage, but as the quarterback usually remains in the pocket, the free safety is "free" to double cover another player. On pass plays, the free safety is expected to assist the cornerback on his side and to close the distance to the receiver by the time the ball reaches him. Offenses tend to use the play-action pass specifically to make the free safety expect a run play, which would draw him closer to the line of scrimmage, and reduce his effectiveness as a pass defender. Furthermore, quarterbacks often use a technique to "look off" a free safety, by looking away from the intended target receiver's side of the field during a pass play, with the intention to lure the free safety away from that side of the field. This phenomenon often tests how effective a free safety's wit and athleticism are at defending long pass plays. If the offense puts a receiver in the slot, then the free safety may be called upon to cover that receiver. Free safeties occasionally blitz as well. When this happens, the pressure on the quarterback is often very severe since a blitz by a defensive back is not usually anticipated. Because of their speed and deep coverage, free safeties are especially likely to make interceptions. Some examples of the greatest free safeties of all time are Larry Wilson (the first to run the safety blitz), Ed Reed, Earl Thomas, Willie Wood, Jack Tatum,Brian Dawkins, Eric Weddle and Paul Krause.〔(【引用サイトリンク】publisher=FootballBabble.com )〕
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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