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Badminton is a racket sport played by either two opposing players (singles) or two opposing pairs (doubles), who take positions on opposite halves of a rectangular court that is divided by a net. Players score points by striking a shuttlecock (birdie) with their racket so that it passes over the net and lands in their opponents' half of the court. A rally ends once the shuttlecock has struck the ground, and the shuttlecock may only be struck once by each side before it passes over the net.

The shuttlecock is a feathered projectile whose unique aerodynamic properties cause it to fly differently from the balls used in most racquet sports; in particular, the feathers create much higher drag, causing the shuttlecock to decelerate more rapidly than a ball. Shuttlecock flight is strongly affected by wind.

Laws of the game
The following information is a simplified summary of the Laws, not a complete reproduction.

Playing court dimensions


The court is rectangular and divided into halves by a net. Courts are almost always marked for both singles and doubles play, although the laws permit a court to be marked for singles only. The doubles court is wider than the singles court, but both are the same length. The exception, which often causes confusion to newer players is the doubles court has a shorter serve-length dimension.

The full width of the court is 6.1 meters (20 ft), and in singles this width is reduced to 5.18 meters (17 ft). The full length of the court is 13.4 meters (44 ft). The service courts are marked by a center line dividing the width of the court, by a short service line at a distance of 1.98 meters (6.5 ft) from the net, and by the outer side and back boundaries. In doubles, the service court is also marked by a long service line, which is 0.78 meters (2 ft 6 inch) from the back boundary.

The net is 1.55 meters (5 ft 1 inch) high at the edges and 1.524 meters (5 ft) high in the center. The net posts are placed over the doubles side lines, even when singles is played.

The basics
In the traditional scoring system in badminton, games are played to 15 points, except for women's singles which is played up to 11. A match is decided by the best of three games. Only the serving players are able to score a point. In doubles, both players of a pair serve before the service returns to the other side: in order to regain the service, the receiving pair has to win two rallies (not necessarily consecutively).

In 2006 scoring was changed for television viewers: each game is played up to 21 points, with players scoring a point whenever they win a rally. A match is the best of three games.

At the start of the rally, the server and receiver stand in diagonally opposite service courts. The server hits the shuttlecock so that it would land in the receiver's service court. This is similar to tennis, except that a badminton serve must be hit from below the waist in underhand form (upwards), the shuttlecock is not allowed to bounce, and in tennis the players stand outside their service courts.

In singles, the server stands in his right service court when his score is even, and in his left service court when his score is odd.

In doubles, if the serving side wins a rally, the same player continues to serve, but he changes service courts so that he serves to each opponent in turn. When the serving side loses a rally, the serve passes to their opponents (unlike the old system, there is no "second serve"). If their new score is even, the player in the right service court serves; if odd, the player in the left service court serves. The players' service courts are determined by their positions at the start of the previous rally, not by where they were standing at the end of the rally.

A consequence of this system is that, each time a side regain the service, the server will be the player who did not serve last time.

Details
When the server serves, the shuttlecock must pass over the short service line on the opponents' court or it will count as a fault.

If the score reaches 20-all, then the game continues until one side gains a two point lead (such as 24-22), up to a maximum of 30 points (30-29 is a winning score).

At the start of a match a coin is tossed. The winners of the coin toss may choose whether to serve or receive first, or they may choose which end of the court they wish to occupy. Their opponents make the remaining choice. In less formal settings, the coin toss is often replaced by hitting a shuttlecock into the air: whichever side it points to serves first.

In subsequent games, the winners of the previous game serve first. For the first rally of any doubles game, the serving pair may decide who serves and the receiving pair may decide who receives. The players change ends at the start of the second game; if the match reaches a third game, they change ends both at the start of the game and when the leading pair's score reaches 11 points.

The server and receiver must remain within their service courts, without touching the boundary lines, until the server strikes the shuttlecock. The other two players may stand wherever they wish, so long as they do not unsight the opposing server or receiver.

Faults
Players win a rally by striking the shuttlecock onto the floor within the boundaries of their opponents' court. Players also win a rally if their opponents commit a fault. The most common fault in badminton is when the players fail to return the shuttlecock so that it passes over the net and lands inside their opponents' court, but there are also other ways that players may be faulted. The following information lists some of the more common faults.

Several faults pertain specifically to service. A serving player shall be faulted if he strikes the shuttlecock from above his waist (defined as his lowest rib), or if his racket is not pointing downwards at the moment of impact. This particular law was modified in 2006: previously, the server's racket had to be pointing downwards to the extent that the racket head was below the hand holding the racket; and now, any angle below the horizontal is acceptable.

Neither the server nor the receiver may lift a foot until the shuttlecock has been struck by the server. The server must also initially hit the base (cork) of the shutts

ecock, although he may afterwards also hit the feathers as part of the same stroke. This law was introduced to ban an extremely effective service style known as the S-serve or Sidek serve, which allowed the server to make the shuttlecock spin chaotically in flight.

Each side may only strike the shuttlecock once before it passes back over the net; but during a single stroke movement, a player may contact a shuttlecock twice (this happens in some sliced shots). A player may not, however, hit the shuttlecock once and then hit it with a new movement, nor may he carry and sling the shuttlecock on his racket.

It is a fault if the shuttlecock hits the ceiling.

Lets
If a let is called, the rally is stopped and replayed with no change to the score. Lets may occur due to some unexpected disturbance such as a shuttlecock landing on court (having been hit there by players on an adjacent court).

If the receiver is not ready when the service is delivered, a let shall be called; yet if the receiver makes any attempt to return the shuttlecock, he shall be judged to have been ready.

There is no let if the shuttlecock hits the tape (even on service).