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Field goal : ウィキペディア英語版
Field goal

A field goal (FG) is a means of scoring in American football and Canadian football. To score a field goal the team in possession of the ball must place kick, or drop kick, the ball through the goal, i.e., between the uprights and over the crossbar. American football requires that a field goal must only come during a play from scrimmage, while Canadian football retains open field kicks and thus field goals may be scored at any time from anywhere on the field and by any player. The vast majority of field goals, in both codes, are placed kicked. Drop kicked field goals were common in the early days of Gridiron football but are almost never done in modern times. In most leagues, a successful field goal awards three points (a notable exception is in six-man football where, due to the difficulty of making a successful field goal because of the small number of players available to stop the opposing team from attempting a block, a field goal is worth four points).
A field goal may also be scored through a fair catch kick, but this is extremely rare. Since a field goal is worth only three points, as opposed to a touchdown, which is worth six, it is usually only attempted in specific situations (see Strategy).
The goal structure consists of a horizontal crossbar suspended above the ground, with two vertical goalposts apart extending vertically from each end of the crossbar.〔http://static.nfl.com/static/content/public/image/rulebook/pdfs/4_2012_Field.pdf〕 In American football the goals are centered on each end line; in Canadian football the goals are centered on each goal line.
==Strategy==
As a field goal is worth only three points, while a touchdown scores at least six (which usually becomes seven with a successful conversion, and potentially 8 with a two-point conversion), teams will generally attempt a field goal only in the following situations:
*It is fourth down (third down in Canadian rules), especially if the offense is more than a yard or two from a new first down, and within about 45 yards of the goal posts.
*In the first half, there is enough time remaining to execute only one more play.
*In the second half, there is enough time remaining to execute only one more play, and the team on offense needs three points to win or tie (four points in a few leagues given special circumstances).
*The game is in overtime, and a FG is the quickest, easiest, and least risky way to end the match.
Except in desperate situations, a team will generally attempt field goals only when keeping a drive alive is unlikely, and its kicker has a significant chance of success, as a missed field goal results in a turnover at the spot of the kick (in the NFL) or at the line of scrimmage (in the NCAA). In American high school rules and Canadian football, where a missed field goal is treated the same as a punt, most teams still opt not to attempt field goals from very long range since field goal formations are not conducive to covering kick returns. Even under ideal conditions, the best professional kickers historically had difficulty making kicks longer than 50 yards consistently (the NFL record is 64 yards and the CFL record, 62 yards). If a team chooses not to attempt a field goal on their last down, they can punt to the other team. A punt cannot score any points in American football unless the receiving team touches the ball first and the kicking team recovers it (though it can result in a single in Canadian football), but it may push the other team back toward its own end.
The longest field goal kick in NFL history is 64 yards, a record set by Matt Prater on December 8, 2013. The previous record was 63, originally set by Tom Dempsey and then matched by Jason Elam, Sebastian Janikowski, and David Akers. High school, college and most professional football leagues offer only a three-point field goal; however, some professional leagues have encouraged more rare kicks through ''four-point field goals''. NFL Europe encouraged long field goals of 50 yards or more by making those worth four points instead of three (much like Australian rules' Super Goal or basketball's three-point line), a rule since adopted by the Stars Football League. Similarly, the sport of arena football sought (unsuccessfully) to repopularize the drop kick by making that worth four points; it failed, since only one kicker (Brian Mitchell) was able to do it with any semblance of proficiency. (In six-man football, where there is no offensive line, all field goals are worth four points instead of the usual three.)
The overall field goal percentage during the 2010 NFL season was 82.3. In comparison, Jan Stenerud, the only pure kicker in the Pro Football Hall of Fame, had a career field goal percentage of 66.8 from 1967 to 1985.〔

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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