Principles of play :
Each team of five players consists of two forwards, two guards, and a centre, usually the tallest man on the team. At the beginning of the first period of a game, the ball is put into play by a jump ball at centre court; i.e., the referee tosses the ball up between the opposing centres, higher than either can jump, and when it descends each tries to tap it to one of his teammates, who must remain outside the centre circle until the ball is tapped.
Subsequent periods of professional and college games begin with a throw in from out-of-bounds. Jump balls are also signaled by the officials when opposing players share possession of the ball (held ball) or simultaneously cause it to go out-of-bounds. In U.S. college games the alternate-possession rule is invoked in jump ball situations, with teams taking turns getting possession.
After each successful basket (field goal) the ball is put back in play by the team that is scored on, by one player passing the ball in from behind the end line where the score was made. The ball is put in play in the same manner after a successful free throw or, if two have been awarded, after the second if it is successful. After nonshooting violations the ball is awarded to the opposing team to be passed inbounds from a point designated by an official.
A player who takes possession of the ball must pass or shoot before taking two steps or must start dribbling before taking his second step. When the dribble stops, the player must stop his movement and pass or shoot the ball. The ball may be tapped or batted with the hands, passed, bounced, or rolled in any direction.
As basketball has progressed, various coaches and players have devised intricate plays and offensive maneuvers. Some systems emphasize speed, deft ball handling, and high scoring; others stress ball control, slower patterned movement, and lower scoring. A strategy based on speed is called the fast break , When fast-break players recover possession of the ball in their backcourt, as by getting the rebound from an opponent’s missed shot, they race upcourt using a combination of speed and passing and try to make a field goal before the opponents have time to set up a defense.
Some teams, either following an overall game plan or as an alternative when they do not have the opportunity for a fast break, employ a more deliberate style of offense. The guards carefully bring the ball down the court toward the basket and maintain possession of the ball in the frontcourt by passing and dribbling and by screening opponents in an effort to set up a play that will free a player for an open shot. Set patterns of offense generally use one or two pivot, or post, players who play near the free throw area at the low post positions (within a few feet of the basket) or at high post positions (near the free throw line)
The pivot players are usually the taller players on the team and are in position to receive passes, pass to teammates, shoot, screen for teammates, and tip in or rebound (recover) missed shots. All the players on the team are constantly on the move, executing the patterns designed to give one player a favourable shot—and at the same time place one or more teammates in a good position to tip in or rebound if that player misses.
Systems of defense also have developed over the years. One of the major strategies is known as man-to-man. In this system each player guards a specific opponent, except when “switching” with a teammate when he is screened or in order to guard another player in a more threatening scoring position. Another major strategy is the zone , or five-man, defense. In this system each player has a specific area to guard irrespective of which opponent plays in that area. The zone is designed to keep the offense from driving in to the basket and to force the offense into taking long shots.
A great many variations and combinations have been devised to employ the several aspects of both man-to-man and zone defensive strategies. The press, which can be either man-to-man or zone, is used by a team to guard its opponent so thoroughly that the opposition is forced to hurry its movements and especially to commit errors that result in turnovers. A full-court press applies this pressure defense from the moment the opposition takes possession of the ball at one end of the court. Well-coached teams are able to modify both their offensive and defensive strategies according to the shifting circumstances of the game and in response to their opponents’ particular strengths and weaknesses and styles of play.
Britannica / Sports / Basketball