Badminton, game that somewhat resembles tennis and involves use of a net, lightweight rackets, and a shuttlecock, a cork ball fitted with stabilizing feathers. It is played by two or four players, either indoors or outdoors, on a marked-out area 44 ft (13.41 m) long by 17 ft (5.18 m) wide for the two-player game and 20 ft (6.10 m) wide for the four-player game. A net is fixed across the middle of the court, with the top edge of the net set to a height of 5 ft (1.52 m) from the ground at the center and 5 ft 1 in (1.55 m) at the posts. The players hit the shuttlecock back and forth over the net with the rackets. A point can be won only by the serving side. If the serving side fails to return the shuttlecock, it loses the serve; if the receiving side fails to return the shuttlecock, it loses the point and must receive again. A game is played to 15 points, except in women's singles, in which a game is played to 11 points. If the score is tied near the end of a game, the game may be decided through a tiebreaking procedure called setting, which involves different rules for men's and women's competition and depending on the point at which the score is tied. A badminton match consists of winning two out of three games. The governing body of the sport in the United States is the U.S. Badminton Association (USBA), located in Colorado Springs, Colorado. The international governing body is the International Badminton Federation (IBF), located in Cheltenham, England. Badminton world championships in men's and women's singles and doubles, and in mixed doubles (doubles teams composed of one man and one woman), were first held in 1977 in Malmö, Sweden. At the 1992 Olympic Games in Barcelona, Spain, badminton was first contested as an official Olympic sport.