i think u will find in a walk of match.if u have number1, no one can go past u untill u decide to stop at a swim, and if u put ur gear down to fish that swim,then they can pass you by, but any swims you have passed by, people can drop in if they want to fish that swim, so if number 20 is last to go he can not over take number 1 if he is still walking and so on