Badminton is a sport often played indoors. It is played using a racquet to hit a shuttlecock across the net. It is usually played with one player per side (singles) or two players per side (doubles).
The player who reaches 21 points shall win the game. For singles, a match consists of three games, and the side that scores 21 points first wins. If the score becomes 20-20, the side that scores two consecutive points wins whereas if the score becomes 29-29, the side that scores the 30th point wins the game. Both sides get a two-minute break between the first and second games followed by another between the second and third game.
However, in the doubles matches, only one service takes place. The back service line remains and the current rule applies.