With the change to the 21-point rally scoring system (NSS), inevitably there are related changes and other relevant updates to the Laws of Badminton by the BWF, which were approved and adopted in May 2006.. Here are some that I've spotted: 7. SCORING SYSTEM (There is now no difference between men's singles (formerly 15 points) and women's singles (formerly 11 points) and little or no confusion on deuce and setting as these are non-existent in the NSS. 7.2 A game shall be won by the side which first scores 21 points, except as provided in Law 7.4 and 7.5. 7.3 The side winning a rally shall add a point to its score. A side shall win a rally, if the opposing side commits a 'fault' or the shuttle ceases to be in play because it touches the surface of the court inside the opponent's court. So every rally counts as a point for or against. Unlike the OSS (old scoring system) when a side can 'win back' the service without scoring a point. 7.4 If the score becomes 20-all, the side which gains a two point lead first, shall win that game. So there is no need to call 'deuce' and 'set' to how many points as in the OSS. But the umpire should call the side that reaches 20 points first "20 game point...". Game point should only be called once throughout the game, unless the side that subsequently reached 29 points first, then another call will be made for "29 game point 28" or "29 match point 28" if it is in the final (third) game. So in a game, the maximum number of times game point is called is only twice, unlike before. 7.5 If the score becomes 29-all, the side scoring the 30th point shall win that game. Note that the call is 29-all not 29-29 or others like 20-20 (20-all) or 25-25 (25-all). 8. CHANGE OF ENDS 8.1 Players shall change ends: 8.1.2 at the end of the second game, if there is to be a third game; and (Previously: prior to the beginning of the third game (if any) 8.1.3 in the third game when a side first scores 11 points. (Not 6 or 8 previously,) 9. SERVICE (Some interesting and more definite changes as regards correct service.) 9.1 In a correct service: 9.1.1 neither side shall cause undue delay to the delivery of the service once the server and the receiver are ready for the service. On completion of the backward movement of server's racket head, any delay in the start of the service (Law 9.2), shall be considered to be an undue delay, The second sentence is added to make it clear that once the server moves his racket backward he must then move it forward as quickly as possible to strike the shuttle without undue delay. He can't stop too long when his racket has been pulled backward before he moves it forward for example. It has to be smooth and he can't make intermittent stops along the way. 9.1.5 the whole shuttle shall be below the server's waist at the instant of being hit by the server's racket. The waist shall be considered to be an imaginary line round the body, level with the lowest part of the server's bottom rib; This is perhaps the clearest definition of the waist which in the past has caused a lot of confusion. and if read in conjuction with Law 9.1.6 below, it has now taken away many irrelevant and unwanted misunderstanding and argument. 9.1.6 the shaft of the server's racket at the instant of hitting the shuttle shall be pointing in a downward direction; 9.2 Once the players are redy for the service, the first forward movement of the server's racket head shall be the start of the service. 13. FAULTS It shall be a 'fault': 13.2 if, in service, the shuttle: 13.2.1 is caught on the net and remains suspended on its top; (but not when in play, then it will be a 'let'.) 13.2.2. after passing over the net, is caught in the net; or 13.3 if in play, the shuttle: 13.3.3 fails to pass over the net (So now, if a shuttle is hit outside a post, did not pass over the net, but eventually falls in the opponent's court, it is a fault. Previously not a fault.) Please add more observations if you have. If you wish, you can also ask questions on the Laws to clarify any situation.