The other rule I was not aware of but a PGA pro (I believe Boo weekly) suffered a two stroke penalty, is that if a fellow player is on the green you can not remove the flag unless that player requests you to do so, there was a rookie with a 50 ft putt and did not have the flag attended, the ball is headed for the hole and Boo rushes over and removes the flag just before it goes in, he got a two stroke penalty. Ouch