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A fumble in American and Canadian football occurs when a player who has possession and control of the ball loses it before being downed (tackled) or scoring. By rule, it is any act other than passing, kicking, punting, or successful handing that results in loss of player possession. A fumble may be forced by a defensive player who either grabs or punches the ball or butts the ball with his helmet (a move called "tackling the ball"). A fumbled ball may be recovered and advanced by either team (except, in American football, after the two-minute warning in either half or 4th down, when the fumbling player is the only offensive player allowed to advance the ball, otherwise the ball is ruled dead at the spot of recovery if the ball bounces backwards or spotted at the point of the fumble if the ball travels forward). It is one of three events that can cause a turnover (the other two being an interception or on downs, though the latter does not count toward the team's total turnovers), where possession of the ball can change during play. Under American rules a fumble may be confused with a muff. A muff occurs where a player drops a ball that he does not have possession of, such as while attempting to catch a lateral pass or improperly fielding a kicking play such as a punt (you cannot "fumble" a loose ball). Ball security is the ability of a player to maintain control over the football during play and thus avoid a fumble. ==Rules== If the ball is fumbled the defensive team may recover the ball and even advance it to their opponents' goal. The same is true for the offense, but usually when the offense recovers the ball it simply tries to down it. In American football the offense cannot advance the ball if it recovers its own fumble on fourth down, or in the last two minutes of the game, unless the ball is recovered by the fumbler (there are no such restrictions in Canadian football). However, if the offense fumbles the ball, the defense recovers and then fumbles back to the offense, they would get a first down since possession had formally changed over the course of the play even though the ball had never been blown dead. In American football, there is no separate signal to indicate a fumble recovery. If the offense recovers its own fumble, the official will indicate the recovery by a hand signal showing the next down. If the defense recovers the fumble, the official will indicate with a "first down" signal in the direction the recovering team is driving the ball. Some officials have erroneously used a "first down" signal when the offense recovers its own fumble and the recovery did not result in a first down. This is not the same thing as when a forward pass is attempted and is not caught. In this latter case, it is simply an incomplete pass. However, if the receiver catches the ball, but then drops it after gaining control of the ball, that is considered a fumble. Any number of fumbles can be committed during a play, including fumbles by the team originally on defense. Most famously, Dallas Cowboys defender Leon Lett fumbled during Super Bowl XXVII while celebrating during his own fumble return. A sometimes controversial rule is usually referred to as "the ground cannot cause a fumble". If a player is tackled and loses control of the ball at or after the time he makes contact with the ground, the player is treated as down and the ball is not in play. However, in the NFL and CFL, if a ball carrier falls without an opponent contacting him, the ground can indeed cause a fumble. This is because in those leagues the ball carrier is not "down" unless an opponent first makes contact, or the runner is out of bounds. If a player fumbles in most other leagues, as soon as the knee or elbow touches the ground, the ball carrier is considered down. It is also possible for the ground to cause a fumble in college football if the ball hits the ground before any part of the ball carrier's body (other than the hand or foot) touches the ground. An example was the fumble by Arkansas quarterback Clint Stoerner vs. Tennessee in 1998. The effects of fumbles vary when the ball goes out of bounds without being recovered: * A fumble going out-of-bounds between the endzones is retained by the last team with possession (in Canadian football, the last team to touch the ball). If the ball was moving backwards with regard to the recovering team, it is spotted where it went out of bounds. If the ball was moving forwards, it is spotted where the fumble occurred (the fumble itself cannot advance the ball). * A fumble going out-of-bounds in the endzone being attacked results in the defending team assuming possession via touchback if the offensive team forced the ball into the endzone. If the defensive team forced the ball into the endzone it is a safety for the offense. * A fumble going out-of-bounds in the endzone being defended is ruled a safety if the offensive team forced the ball into the endzone. * A fumble going out-of-bounds in the endzone being defended is ruled a touchback if the defensive team forced the ball into the endzone. The ball is turned over to the defensive team. In all cases, a fumble recovered by an out-of-bounds player is considered an out-of-bounds fumble even if the ball never leaves the field of play. In addition, a punted or place-kicked ball that touches any part of a player on the receiving team, whether or not the player ever gains control, is considered to be live and is treated like a fumble. Also, lateral passes that are caught by a member of the opposing team are recorded as fumbles as opposed to interceptions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fumble」の詳細全文を読む スポンサード リンク
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