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In the sport of association football, a defender is an outfield player whose primary role is to prevent the opposing team from scoring goals. There are four types of defenders: centre-back, sweeper, full-back, and wing-back. The centre-back and full-back positions are essential in most modern formations. The sweeper and wing-back roles are more specialised for certain formations. ==Centre-back== A centre-back (also known as a central defender or centre-half) defends in the area directly in front of the goal, and tries to prevent opposing players, particularly centre-forwards, from scoring. Centre-backs accomplish this by blocking shots, tackling, intercepting passes, contesting headers and marking forwards to discourage the opposing team from passing to them. With the ball, centre-backs are generally expected to make short and simple passes to their teammates, or to kick unaimed long balls down the field. For example, a clearance is a long unaimed kick intended to move the ball as far as possible from the defender's goal. During normal play, centre-backs are unlikely to score goals. However, when their team takes a corner kick or other set piece centre-backs may move forward to the opponents' penalty area: if the ball is passed in the air towards a crowd of players near the goal then the heading ability of a centre-back is useful when trying to score. In this case other defenders or midfielders will temporarily move into the centre-back positions. In the modern game, most teams employ two or three centre-backs in front of the goalkeeper. The 4–2–3–1, 4–3–3, and 4–4–2 formations all use two centre-backs. 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. 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「Defender (association football)」の詳細全文を読む スポンサード リンク
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