Well, since badminton is taught at different levels and phys-ed teachers may alter the rules for max game play for his purpose. There are a few rules that no one, I mean NO ONE in my school knew and after I enlightened them, they did not believe until the coach vocuhed for me. 1. Your racket CANNOT cross over the net anytime. It may cross if the birdie was on your court when it was hit and if it was the result of a swing motion originated from your side of the court. 2. You can NEVER cross underneath the net with your feet or racket. you may cross if the opponent is not distracted so that he cannot perform the shot. 3.You CANNOT lunge at a serve. You cannot move until the birdie is hit and at that time you may do anything. 4. You CANNOT clash your racket. As long as you both don't hit it its fine. 5. If you play (hit) a shot that was the result of a double it counts! No it doesn't. 6. If the bird hits the net during a serve, it is considered a "net" and a reserve occurs. This isnt ping pong~~ 7. You may go to the bathroom/leave the court after each set. You cannot leave the court for the first two matches but you may bring water to drink in between sets. You may go to the bathroom after the second set. I know there are more out there. I think that it is a main problem when people representing their schools don't know the rules themselves. We should alert at least the BF'er's about these concealed rules. All feedback is welcome and corrections as well. I may have been wrong in the above rules.