Badminton: rules and scoring

Games to 21, every rally is a point; at 29-29, the 30th point wins.

Games go to 21 points and every rally is a point. At 20-20 you need a 2-point lead; at 29-29 the 30th point wins.
Best of 3 games. The winner of each rally serves the next point.
Players change ends after each game and at 11 points in the third game.

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