Got the article below from Wikipedia.org
Centre backThe job of the centre backs or central defenders is to stop opposing players, particularly the strikers, from scoring, and to bring the ball out from their penalty area. As their name suggests, they play in a central position. Most teams employ two centre backs, stationed in front of the goalkeeper. There are two main defensive strategies used by centre backs: the zonal defence, where each centre back covers a specific area of the pitch, and man-to-man marking, where each centre back has the job of covering a particular opposition player.
Centre backs are often tall, with good heading and tackling ability. An ability to read the game well is a distinct advantage. Sometimes centre backs concentrate less on ball control and passing, preferring to merely clear the ball in a "safety-first" fashion. However, there is a long tradition of centre backs having more than just rudimentary footballing skill, enabling a more possession-orientated playing style.
The position is sometimes referred to as centre half. In the early part of the 20th century, when most teams employed the 2-3-5 formation, the row of three players were called half backs. As formations evolved, the central player in this trio (the centre half), moved into a more defensive position on the field, taking the name of the position with him.
SweeperThe sweeper is a more versatile type of centre back that "sweeps up" the ball if the opponent manages to breach the defensive line. His or her position is rather more fluid than other defenders who man-mark their designated opponents. Because of this, the position is often referred to as libero (from the Italian: free). The sweeper's ability to read the game is even more vital than for a centre back. A sweeper is sometimes expected to build counter-attacking moves, and as such requires better ball control and passing ability than a typical centre back. However, sweepers are often merely defensive players. For example, the catenaccio system of play, used in Italian football in the 1960s, employed a purely defensive sweeper.
Full backThe full backs take up the wide defensive positions, one on each side of the field. Their main task is to prevent opposition players crossing or cutting the ball back into the penalty area. In some defensive systems, full backs man-mark opponents. Most full backs are also expected to provide an attacking dimension by getting upfield along the wings and providing crosses.
Traditionally, the full backs (the "2" in the 2-3-5 formation) played a role today occupied by the central defenders. As the game evolved, with the old centre half taking over the central defensive role, full backs have migrated out to the flanks and the position now requires a slightly different set of skills. The modern full back is usually pacy, strong in the tackle and with good stamina to get up and down the field.
The wingback is a modern variation on the full back with heavier emphasis on attack. They are usually employed in a 3-5-2 formation, and could therefore be considered part of the midfield. As the role combines that of the winger and the full back, wing backs need to be blessed with good stamina. As they have the support of three centre backs, they are expected to concentrate more on providing support for strikers and less on their defensive duties.
Centre midfieldCentral midfielders play a number of roles on the field of play, depending on their particular strengths and weaknesses and the tactics of the team. They are the link between defence and attack, and must also defend when the opposition are in possession. Their central position enables them to have an all-round view of the match, and as most of the action takes place in and around their area of the pitch, midfielders often exert the greatest degree of control over how a match is played.
Central midfielders are often divided into defensive and attacking midfielders. A defensive midfielder, or "holding midfielder", shares many characteristics with a centre back. Their main priority is to distribute a ball effectively when in possession of the ball, or to break up an opponent's attack when not. Attacking midfielders are expected to create scoring chances for team mates and to try to score goals themselves.
All midfielders need excellent fundamental footballing skills, i.e. good ball control and passing, as well as good stamina. In addition, defensive midfielders should particularly be strong in the tackle. For attacking midfielders, especially the breed known as "playmakers", the vision and awareness to spot and pass to team-mates in a good position can create invaluable scoring chances for a striker. Of all the positions, midfield is possibly the one where raw speed is the least important, as this can be compensated for by ability on the ball.
Winger and wide midfielderThe out-and-out winger is a position that has been less fashionable since Alf Ramsey's England side — the "Wingless Wonders" — won the World Cup in 1966. The job of the winger is simply to provide crosses or cut-backs into the penalty area for the strikers to score from. Traditionally this was done using pace or dribbling ability to beat opposing full backs. Wingers were not expected to contribute to the defence.
The wide, or side midfielder is a modern development of the winger role. Side midfielders are similarly expected to support the strikers, but are also expected to help with defensive duties in the wide areas. Other roles include retaining possession of the ball in the wings to allow the fullback to overlap them, and offering wide passing options for the central midfielders in games where the midfield is heavily congested. However, the distinction between wingers and wide midfielders is blurred: many outside midfielders can still legitimately be classed as wingers.
Centre forwardThe centre forward has one main task: to score goals. There are two commonly categorized types of centre forward: the "target man" and the "link man". Most teams that play with two strikers will field an attacker of each type, although many play a number of other variations.
Target men are usually of above-average height, with good heading ability and an accurate shot. The target man will tend to score goals from crosses, often with the head, and use the body strength to shield the ball while turning to score.
Link men are often smaller in stature, preferably with dribbling skills and good pace. They are expected to contribute goals as much as to create chances for the target man. Smaller strikers tend to prefer to use their pace to run onto a ball passed over the opposition defence, rather than to collect the ball with their back to goal in the manner of a target man.
Deep-lying forwardsDeep lying forwards have a long history in the game, but the terminology to describe them has varied over the years. Originally such players were termed inside forwards, or deep-lying centre forwards. More recently, the preferred terms have been "withdrawn striker" or playing "in the hole" (i.e., the space between the midfield and defence of the opposing team).
Whatever the terminolgy, the position itself is a loosely-defined one somewhere between the out-and-out striker and the midfield. Such a player is either a skilful, attack-minded midfielder or a striker who can both score and create opportunities for a centre forward.
The list of deep-lying forwards of renown below thus contains players who can be described as inside forwards, attacking midfielders, or "hole" players, depending largely on the terminology of their own day.
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