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Zone defense is a type of defense, used in team sports, which is the alternative to man-to-man defense; instead of each player guarding a corresponding player on the other team, each defensive player is given an area known as a "zone" to cover. A zone defense can be used in virtually all sports where defensive players guard players on the other team. The names given to zone defenses start with the number of players on the front of the zone (farthest from the goal) followed by the numbers of players in the rear zones. For example, in a 2–3 zone two defenders are covering areas in the top of the zone (near the top of the key) while three defenders are covering areas near the baseline. Other types of zone defense include: * Match-up zone, a hybrid man-to-man and zone defense in which players apply man-to-man defense to whichever opposing player enters their area. John Chaney, former head coach of Temple University, is the most famous proponent of this defense. * Box-and-one in which four defenders are in a 2–2 zone and one defender guards a specific player on the offense. A variant of this is the triangle-and-two, in which three defenders are in a 2–1 zone and two defenders guard two specific offensive players. This scheme was invented by National Basketball Hall of Fame coach and former Temple University head coach Harry Litwack. When a team plays a zone, the defenders must keep their hands up and in passing lanes and quickly adjust their positions as the ball and the offensive players move around. Teams that successfully play zone defenses are very vocal and effectively communicate where they, the ball, and their opponents are or will be. Teams playing a zone occasionally try to "trap" the ball handler, an aggressive strategy of double-teaming the ball carrier. While this tactic may cause a turnover, it leaves one or more players on the offense undefended. The undefended player(s) are generally schemed to be on the opposite side of the court, away from the ball, so any attempt to pass the ball to them would result in long distance pass or a relay pass by a third offensive player, allowing the defense to recover. Good ball handlers can also try to "split" the trap by bringing the ball through the space in the middle of the two trapping defenders, creating an instant advantage for the offense. Zone defenses were prohibited in the National Basketball Association prior to the 2001–2002 season. The NBA now permits the use of zones, though most teams don't use them as a primary defensive strategy, and zone defenses featuring an unguarded defender inside the free-throw lane are still disallowed (a violation that results in a defensive three-second violation, which is a technical foul). The Dallas Mavericks are an example of an NBA team that regularly uses zone defenses. During the 2011 Playoffs, their zone defense was credited with slowing down offenses, forcing opposing players to determine which defense they were playing.〔http://espn.go.com/blog/TrueHoop/post/_/id/30227/carlisle-pushed-all-of-the-right-buttons〕 Zone defenses are more common in international, college, and youth competition. ==Advantages== Some of the reasons for using a zone defense are: * The opposing team has a player or players too quick (in the case of guards) or too big (in the case of forwards or centers) for a man-to-man defense to be effective. * Many zones pack defenders in the lane but allow the offensive team to take long-range shots. If the opponents are poor long-range shooters, a zone can be very effective. * Unless trapping is involved, zone defenses typically don't involve aggressive pressure on the ball handler and allow the offensive team to easily pass the ball around the perimeter. This can allow the offense to use more time before a shot is attempted, an advantage for teams wanting to slow the tempo of a game. * A poor defensive player can often be "hidden" in a zone because teammates can more easily help if he or she is beaten. * A zone can help players in danger of fouling out by taking pressure off them. * Playing a zone is less tiring and thus can help teams suffering from fatigue. * To prevent easy scores when the ball is in-bounded under the basket. * Against teams with inexperienced guards, trapping zones can disrupt the offense and force turnovers. 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「zone defense」の詳細全文を読む スポンサード リンク
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