blocking the plate question

[sumfan]

great forum
i am a asa coach and before that a youth league coach.
i have a question for you.
what is the proper way according to the asa rules ( i have been reading the rule book but have not found it)
for a player to positon herself to recieve the throw at a base
we have told our girls to staddle the base and leave the center open
at some asa tournys this was fine but at some it was not
the girls were told they had to be behind the plate or to the side.
i am just looking for the best way to instruct our girls

as i stated before a great forum i have been reading the posts and have learned alot of useful information

thank you for your time
sumfan