[greymule]

Here's my two cents, the way I call them, and they way I see them called here in New Jersey:

For high-level girls' FP: A and of course B are strikes and will get no argument from anybody. A strike even an inch lower will evoke no noise at all. C is far too high—the crowd would erupt at a strike call up there, no matter what the book says. As one local NCAA ump told me, they teach the whole ball (not a part of the ball) under the armpits, but in practice it has to be lower than that. I think around here the entire zone is moved a few inches down, with the top end more like MLB and the low end lower than baseball. Any part of the ball catches the hollow under the kneecap, it's a strike. D will get a strike call. E will not.

That's the general practice here. And the corners of the zone are rounded; some umps call it an oval. Not saying these things are right or wrong—it's just what everybody seems to expect.