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Number Eight (rugby union) : ウィキペディア英語版
Rugby union positions

In the game of rugby union, there are 15 players on each team, comprising eight forwards (numbered 1–8) and seven backs (numbered 9–15). In addition, there may be up to eight replacement players "on the bench". Jersey numbers 16–23 differentiate them. Players are not restricted to any single position on the field, although they generally specialise in just one or two that suit their skills and body types. Players that specialise in over three positions are called "utility players". The scrum (an assemblage used to restart play), however, must consist of eight players consisting of: the "front row" (consisting of two props, a loosehead and tighthead, plus a hooker), the "second row" (consisting of two locks), and a "back row" (consisting of two flankers, and a No 8). The players outside the scrum are called "the backs" and consist of: scrum-half, fly-half, two centres, (inside and outside), two wingers, and a fullback. Early names, such as "three-quarters" (for all the backs) and "outside-halves" (for fly-half) are still used by most people (i.e. the Northern Hemisphere), while in the Southern Hemisphere the fly-half and inside centre are colloquially called "first five-eighth" and "second five-eighth" respectively, while the scrum-half is known as the half-back.
The backs play behind the forwards and are usually more lightly built and faster. Successful backs are skilful at passing and kicking. Full-backs need to be good defenders and kickers, and have the ability to catch a kicked ball. The wingers are usually among the fastest players in a team and score many of the tries. The centres' key attacking roles are to try and break through the defensive line and link successfully with wingers. The fly-half can be a good kicker and generally directs the backline. The scrum-half retrieves the ball from the forwards and needs a quick and accurate pass to get the ball to the backs (often firstly to the fly-half). Forwards compete for the ball in scrums and line-outs and are generally bigger and stronger than the backs. Props push in the scrums, while the hooker tries to "hook" the ball. Locks are tall and jump for the ball at the line-out after the hooker has thrown it in. The flankers and number eight should be the first forwards to a tackle and play an important role in securing possession of the ball for their team.
==Overview==

There are a maximum of 15 players from each team on a rugby field at one time. The players position at the start of the game is indicated by the number on the back of their shirts, 1 to 15. The positions are divided into two main categories; forwards (numbered 1 to 8) and backs (numbered 9 to 15). In international matches, there are eight substitutes that can replace an on-field team member. The substitutes, numbered 16 to 23, can either take up the position of the player they replace or the on-field players can be shuffled to make room for this player in another position. Typically, the replacement players will have a number that corresponds with their intended replacement position with the numbers from 16 to 20 being forwards and 21 to 23 being backs (depending on the composition of the reserves). There are no personal squad numbers and a versatile player's position and number may change from one game to the next. Players can also change positions with players on the field during the match, and, as long as the laws are followed, any player can change positions with another player during the match. Common examples are the fly-half playing the full-back's position in defence or a prop taking the hooker's position at line-outs.
Different positions on the field suit certain skill sets and body types, generally leading to players specialising in a limited number of positions.〔(【引用サイトリンク】title=A Beginner's Guide to Rugby Union )〕 Each position has certain roles to play on the field, although most have been established through convention rather than law. During general play, as long as they are not offside, the players may be positioned anywhere on the field. It is during the set pieces, scrum and line-out, when the positions are enforced. At line-outs there must be at least two players from each team lined up five metres from where the ball crossed the side line. They form two straight lines next to each other and a player from the team awarded the line-out throws the ball between them. A player from each team stands two metres from the line-out and the opposing team must also have someone standing two metres from the player throwing the ball in. The remainder of the team not participating in the line-out must be positioned at least 10 metres back from the line-out.〔(【引用サイトリンク】title=IRB Laws - The IRB's Law Education Web Site )〕 While anyone on the field can be part of a line-out, it is generally composed of forwards. The usual situation involves the hooker throwing the ball in, aiming for the locks that are lifted into the air by the props. The scrum-halves are usually positioned near the line-out ready to receive the ball once the forwards have gained possession.
Each team must have eight players in the scrum, unless for some reason (i.e. a sending-off or injury) they cannot field 15 players. Specialised front-row players (i.e. props and hookers) must be part of the scrum for safety reasons under the law. If a specialised player is not available, the scrum must have 'no weight', which means no player is allowed to push forward once the scrum commences. In cases where a front-row player is off the field due to a yellow card (compulsory 10 minutes off the field) or a red card (no longer allowed to participate in the game), a temporary substitution of another player is mandatory to ensure specialist front-row players participate in the scrum. If a team cannot field eight in the scrum, generally it drops the flankers or the number eight, but the props, hooker and locks must be maintained.〔(【引用サイトリンク】title=IRB Laws - The IRB's Law Education Web Site )
The props (1 and 3) bind on either side of the hooker (2) to form the front row of the scrum. The two locks (4 and 5) bind together and push on the props and the hooker. The flankers (6 and 7) bind to the side of the scrum and the number eight (8) pushes on the locks or a lock and a flanker. Once each team has formed its half of the scrum, the two front rows are brought together under the command of the referee. The scrum-half puts the ball into the middle of the scrum and then retrieves it from under the number eight's feet if it is successfully won. The remainder of the team must be positioned at least five metres back from the scrum.

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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