The badminton rules you actually need on court

Law 7 is short and worth knowing in full. A match is best of three games. A game goes to 21 points. The side winning a rally adds a point to its score — whether it served or received.

That last clause is the whole modern game. Before 2006, only the serving side could score, which is why old matches went to 15 and could stall for twenty minutes on one serve. Since rally scoring arrived, every rally is worth something to both sides.

A game ends in one of two ways:

• Someone reaches 21 with at least a two-point lead.
• The score reaches 20-all, and then the first side to lead by two takes the game — 22-20, 23-21, and so on.

The exception to that exception is the cap. At 29-all, the next point wins: 30-29 takes the game without any margin at all. It exists so that a deuce spiral cannot run forever, and it is the only moment in badminton where a single point ends a game while the scores are level.

The side that wins a game serves first in the next one.

This is the rule that new players get wrong most often, and it is genuinely simple:

Serve from the right service court when your side's score is 0 or an even number. Serve from the left when it is odd.

Your opponent's score does not enter into it. Neither does whose turn it feels like. In singles, that means you also receive in the court diagonally opposite the server, so both players end up switching sides every time the server's score changes parity.

The consequence is a useful self-check: if you have just won a rally on your own serve and you are still standing in the same service court, someone has made a mistake. Winning your own serve always moves you across.

Service itself has four conditions that a strict umpire will watch (Law 9). The whole shuttle must be below the server's waist at the moment of contact, where the waist is defined as a line level with the lowest rib. The racket shaft and head must point downward. Both players must have some part of both feet in contact with the court, stationary, from the start of the serve until it is delivered. And neither side may cause undue delay once both are ready.

Here is the rule that costs club players the most points, and it takes one sentence: in doubles, a side does not take turns serving within a turn.

When your side wins the serve, one player serves — the one standing in the correct service court for your score. If you win the rally, you score a point, you and your partner swap courts, and the same player serves again from the other side. That continues until you lose a rally, at which point the serve passes to your opponents. Your partner does not get "their" serve.

The receiving side, meanwhile, does not swap anything. Receivers stay where they are until they win the serve back.

Two consequences follow, and they are where the confusion lives:

Who serves when we win the serve back? Whoever is standing in the correct court for your side's score. Because you never swapped while receiving, that is decided by where you happened to be when you last lost the serve.

Who receives? The player standing diagonally opposite the server. Again, no rotation — the receiving pair simply holds position.

If a service court error happens and is discovered, the correction is made and the existing score stands. Nobody replays anything.

Play is continuous from the first service until the match ends, with exactly two scheduled breaks (Law 16.2):

• 60 seconds during each game, when the leading score reaches 11.
• 120 seconds between the first and second game, and between the second and third.

Both are limits, not entitlements you can stretch. For a televised match the referee may declare them mandatory and of fixed duration, which is why professional players are back on court exactly on time.

Ends change three times (Law 8): after the first game, after the second game if there is going to be a third, and in the third game when a side first reaches 11 points. That last one is the one people forget in club matches. If you notice the mistake later, change ends as soon as the shuttle is out of play — the existing score stands.

Delay beyond the intervals is a matter for the umpire, who can warn a side, fault it if it has already been warned, and fault it immediately for a flagrant offence. Repeated or serious misconduct goes to the referee, who has the power to disqualify.

Most badminton faults are obvious: the shuttle lands out, hits the net and stays on your side, or is hit twice. A handful are less obvious and account for the arguments:

Touching the net. If your racket, your body or your clothing touches the net or its posts while the shuttle is in play, that is a fault. Following through past the net is fine as long as nothing touches it.

Reaching over the net to hit. You may not strike the shuttle before it crosses to your side. You may follow through over the net after making contact on your own side — the difference is where contact happened, not where the racket finished.

Obstruction. Invading an opponent's court under the net so as to obstruct them is a fault, and so is deliberately distracting an opponent, including by shouting.

Double hit. A shuttle hit twice in succession by the same player, or once by a player and once by their partner, is a fault. A single stroke where the shuttle touches the racket head and strings in one motion is not.

The service court. Serving or receiving from the wrong court is a fault when it is spotted and not corrected — but the correction, once made, leaves the score intact.

From 4 January 2027 the standard scoring system becomes best of three games to 15, approved by BWF member associations at the 87th Annual General Meeting on 25 April 2026. The current 3×21 stays available as an approved alternative, so you may meet both systems in the same season.

For a player, four numbers move:

	3×21	3×15
Game to	21	15
Deuce from	20-all	14-all
Cap	29-all → 30	20-all → 21
Interval and change of ends	11	8

Everything else is untouched. Rally scoring, best of three, the winner of a game serving first in the next one, the 120-second break between games, the service court rule, the doubles rotation — none of it changes. The amendments apply to badminton and Para badminton alike.

The practical adjustment is smaller than it sounds and lands in one place: the endgame arrives sooner. At 12-all in a 15-point game you are three points from a game, not nine. Players who have trained their concentration to sharpen around 18 have to move it forward.