In badminton, the number of points required to win a game depends on the format being played. In singles, the first player to reach 21 points wins the game.
However, if the score is tied at 20-20, the player who takes a two-point lead first, wins the game. In doubles, the first team to score 21 points wins the game in the same way as singles.
However, if the score is tied at 20-20, the game continues until one team has a two-point lead. In both cases, a match consists of the best two-out-of-three games, so a player or team must win two games to win the match.