what type of scoring system is used for badminton

The Laws of Badminton

The Laws of Badminton and Competition Regulations in the BWF Statutes provide the detail on every aspect of the game of badminton.

Below is a cursory overview - simplified rules.

Scoring System

A match consists of the best of 3 games of 21 points.
Every time there is a serve – in that location is a point scored.
The side winning a rally adds a point to its score.
At 20 all, the side which gains a 2 point lead first, wins that game.
At 29 all, the side scoring the 30th point, wins that game.
The side winning a game serves starting time in the adjacent game.

Interval and Change of Ends

When the leading score reaches 11 points, players have a 60 second interval.
A two minute interval between each game is allowed.
In the third game, players change ends when the leading score reaches 11 points.

Singles

At the start of the game (0-0) and when the server's score is even, the server serves from the right service court. When the server's score is odd, the server serves from the left service courtroom.
If the server wins a rally, the server scores a bespeak and then serves again from the alternate service court.
If the receiver wins a rally, the receiver scores a point and becomes the new server. They serve from the advisable service court – left if their score is odd, and right if it is even.
Doubles

A side has merely one 'set'.
The service passes consecutively to the players equally shown in the diagram.
At the beginning of the game and when the score is even, the server serves from the right service courtroom. When it is odd, the server serves from the left courtroom.
If the serving side wins a rally, the serving side scores a point and the aforementioned server serves again from the alternate service court.
If the receiving side wins a rally, the receiving side scores a betoken. The receiving side becomes the new serving side.
The players do not alter their respective service courts until they win a indicate when their side is serving.

If players commit an error in the service courtroom, the mistake is corrected when the error is discovered.

In a doubles match between A & B against C & D. A & B won the toss and decided to serve. A to serve to C. A shall be the initial server while C shall exist the initial receiver.

Grade of action / Explanation

Score

Service from Service Court

Server & Receiver

Winner of the rally

	Love All	Right Service Court. Being the score of the serving side is even.	A serves to C A and C are the initial server and receiver.	A & B
A & B win a point. A & B will change service courts. A serves once again from Left service court. C & D will stay in the same service courts.	1-0	Left Service Court. Being the score of the serving side is odd	A serves to D	C & D
C & D win a point and besides right to serve. Nobody will alter their corresponding service courts.	1-1	Left Service Courtroom. Being the score of the serving side is odd.	D serves to A.	A & B
A & B win a indicate and also right to serve. Nobody will change their corresponding service courts.	2-1	Right Service Court. Being the score of the serving side is fifty-fifty.	B serves to C	C & D
C & D win a point and also right to serve. Nobody will alter their respective service courts.	two-2	Right Service Court. Being the score of the serving side is even.	C serves to B	C & D
C & D win a point. C & D will change service courts. C serves from Left service court. A & B will stay in the aforementioned service courts.	three-ii	Left Service Courtroom. Being the score of the serving side is odd.	C serves to A	A & B
A & B win a point and likewise correct to serve. Nobody will change their respective service courts.	3-3	Left Service Court. Being the score of the serving side is odd.	A serves to C	A & B
A & B win a point. A & B will change service courts. A serves once more from Correct service courtroom. C & D will stay in the same service courts.	iv-3	Right Service Court. Being the score of the serving side is fifty-fifty.	A serves to D	C & D

Note that this means:

The order of server depends on the score odd or even same as in singles.
The service courts are changed by the servicing side only when a point is scored. In all other cases, the players proceed to stay in their corresponding service court from where they played previous rally. This shall guarantee alternating server.