>> How do you know that it doesn't go pitch by pitch and that it's PA then AB? That pretty interesting if you're correct. <<

Back in the old days, the developers would answer questions once or twice a year.

This was posted in one of those treads.

I just did a quick search for Developer Chat and couldn't find them. If you can find them, they're worth reading. Read them all, because back then the game was updated, so something said in the first chat might have changed.