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Scrum-half The scrum half, or half back (numbered 7), directs the game and is usually one of the smaller players. The scrum half and the stand off form a team's creative unit. They control the attack, deciding with their passes how the team attacks and if, when and where the ball is kicked.
There are four backs: scrum-half, fly-half, centre, and wing. The scrum-half feeds the ball into the scrum. The other three players form the backline. Since play is much more open in sevens, with rucks and mauls generally kept to a minimum, most sevens players are backs or loose forwards in fifteen-a-side teams. [109]
0-9 22 The 22 m line, marking 22 metres (72 ft) from the tryline. 89 An "89" or eight-nine move is a phase following a scrum, in which the number 8 picks up the ball and transfers it to number 9 (scrum-half). 99 The "99" call was a policy of simultaneous retaliation by the 1974 British Lions tour to South Africa, (the 99 comes from the British emergency services telephone number which is 999 ...
Numbered 7, the scrum-half or half-back is usually involved in directing the team's play. The position is sometimes referred to as "first receiver", as half-backs are often the first to receive the ball from the dummy-half after a play-the-ball. This makes them important decision-makers in attack.
A scrum in an England versus Scotland international. In rugby union a scrum is a means of restarting play after a minor infringement. It involves up to eight players from each team, known as the pack or forward pack, binding together in three rows and interlocking with the three opposing teams front row.
Martin Roberts (born 6 June 1986) is a Wales international rugby union footballer who plays as a scrum-half.. Born in Aberdare, Roberts began his professional career with Neath RFC, before graduating to the Ospreys regional team, and during his time there would play infrequently for Neath, as well as the Ospreys' other Welsh Premier Division feeder clubs, Swansea and Bridgend.
Racing 92 score 11 unanswered second-half points to break Harlequins' resistance and claim victory in their Investec Champions Cup opener in Paris.
Thus, the amount of material left is 2 −1 = 1/2 raised to the (whole or fractional) number of half-lives that have passed. Thus, after 3 half-lives there will be 1/2 3 = 1/8 of the original material left. Therefore, the mean lifetime is equal to the half-life divided by the natural log of 2, or: