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Originally, a full-back was the last line of defence, but as the game developed in the early 20th century, the centre-half role was dropped backwards and came to be known as 'centre-back', and the full-backs were then pushed out wider to create the right-back and left-back positions. [31]
This position is used in 3-4 formations, or goal line situations. Most nose tackles are 320-350 pounds, and are the biggest players on the roster. This position is the most physically demanding, due to being forced into constant double or triple teams, and needing enough speed to collapse the interior of the offensive line.
The full-backs (the left-back and the right-back) locate the holding wide positions and traditionally stay in defence at all times, until a set-piece. There is one full-back on each side of the field except in defences with fewer than four players, where there may be no full-backs and instead only centre-backs.
The so-called center and fullback are playing left and right versions of the same position. The positions were later renamed "linebacker". However, that did not become the usual way to name that position until platoon football became common, with players specializing in offense or defense, substituted according to which team has the ball. There ...
The fourth back is most commonly employed as an extra wide receiver. Here are three diagrams of I-Formation, strong side right (that is, with the tight end lining up to the right, typical for a right-handed quarterback). Notice that the 4th back required by the rules is the set-back wide receiver at the right (called the flanker).
In 1993, The Football Association (The FA) switched to persistent squad numbers, abandoning the mandatory use of 1–11 for the starting line-up. The first league event to feature this was the 1993 Football League Cup Final between Arsenal and Sheffield Wednesday, and it became standard in the FA Premier League the following season, along with names printed above the numbers. [6]
In Canadian football, which has twelve players on the field compared to the eleven of American football, there is an additional position called defensive halfback, which plays like a hybrid between a linebacker and cornerback. Canadian formations include two cornerbacks, two halfbacks and one safety, for a total of five defensive backs.
A running back turns up the field in an attempt to reach the end zone.. The halfback (HB) or tailback (TB) position is responsible for carrying the ball on the majority of running plays, and may frequently be used as a receiver on short (or sometimes long, depending on the system) passing plays.