In singles the court is thinner, with the wide, outside 'tramlines' out of bounds. In doubles the court is full width and these tramlines are now 'in'. During service in doubles, the court is short, with the rear 'tramlines'at the back of the court, being out of bounds until the serve is returned.
A game shall be won by the side which first scores 21 points, except as provided in Law 7.4 and 7.5.
On a regulation badminton court, the outer sidelines will run the full 13.41m /44.00ft length of the court. The outer sidelines are marked 5.18m (17.00ft) apart and run parallel to one another. Any shot that lands inside the doubles sideline is considered “in” or valid for doubles matches.
The side alley is out of bounds; the back alley is in bounds or good. The serve must carry past the short service line, which is 6.5 feet (about 2 m) from the net, and must not carry beyond the back boundary line. The lines are considered part of the court and in bounds.
Badminton Rules: Doubles – what's in and what's out? During the main part of a badminton doubles rally, every part of the court is in. However, the serve must fall into the 'short and ' area diagonally opposite the server. The side tramlines are in, but the rear tramlines are out during the serve.
The lines marking out the court are easily distinguishable and coloured white or yellow. The lines are 40mm wide. A court may be marked out for singles only. The back boundary lines also become the long service lines and the posts or the strips of material representing them are placed on the side lines.
A singles service court is a box made from four lines: The centre line. A singles side line (inside side line) The front service line. The back line (the outside one, all the way at the back)
The outer sidelines are sometimes referred to as “outer tramlines” or “doubles sidelines”. On a regulation badminton court, the outer sidelines will run the full 13.41m /44.00ft length of the court. The outer sidelines are marked 5.18m (17.00ft) apart and run parallel to one another.
Arm out in front, hand open, palm facing down to signify that the shuttle was in. This can also be shown by a finger pointing down. Similarly for saying a shuttle is out, you can simply point with one finger outwards in the direction it landed out.
Each side of a badminton court has a right and a left service court for singles. Each singles service court is bounded by the short service line, the centerline, the singles sideline and the back boundary line.