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A touchdown is a means of scoring in American and Canadian football. Whether running, passing, returning a kickoff or punt, or recovering a turnover, a team scores a touchdown by advancing the ball into the opponent's end zone. ==Description== To score a touchdown, one team must take the football into the opposite end zone. The touchdown is scored the instant the ball crosses the plane of the goal line—that is if any part of the ball is in the space on, above, or across the goal line—while in possession of a player whose team is trying to score in that end zone. The play is dead and the touchdown scores the moment the ball crosses the goal line in possession of a player, or the moment the ball comes into possession of an offensive player in the end zone (having established possession by controlling the ball and having one or both feet or another part of the body on the ground). The slightest part of the ball being over the goal line is sufficient for a touchdown to score. However only the ball—not a player's helmet, foot, or other part of the body—counts. Touching one of the pylons at either end of the goal line with the ball constitutes "breaking the plane" as well. Touchdowns are usually scored by the offense by running or passing the ball. However, the defense can also score a touchdown if they have recovered a fumble or made an interception and return it to the opposing end zone. Special teams can score a touchdown on a kickoff or punt return, or on a return after a missed or blocked field goal attempt or blocked punt. In short, any play in which a player legally carries the ball across the goal line scores a touchdown, the manner in which he gained possession is inconsequential. In the NFL, a touchdown may be awarded by the referee as a penalty for a "Palpably Unfair Act" such as a player coming off the bench during a play and tackling the runner who would otherwise have scored. A touchdown is worth six points. The scoring team is also awarded the opportunity for an extra point or a two-point conversion. Afterwards, the team that scored the touchdown kicks off to the opposing team, if there is any time left. Unlike a try scored in rugby, and contrary to the event's name, the ball does not need to touch the ground when the player and the ball is inside the end zone, although in gridiron's early days the ball was required to be touched to the ground as in rugby, as rugby and gridiron were extremely similar sports at this point. This rule was changed to the modern-day iteration in 1889. 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「touchdown」の詳細全文を読む スポンサード リンク
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