Describe the scoring system in a game of Badminton.

Scoring in badminton (rally point system): 1. A match is the best of three games, each played to 21 points. 2. A point is scored on every rally, whoever served it. 3. At 20 all, a side must lead by 2 points to win; at 29 all, the side that scores the 30th point wins the game.