Easy to tell if it's a slow or fast pitch rule. Their rule book has completely different sections for each. Without even looking, I'd lay money that you're reading the slow pitch rule.
(Edited to add: Okay, I looked it up. That's the slow pitch rule. Fast pitch rule says that runners may advance on any caught fly ball.)
Bret, the section I posted was from the 2013 Fastpitch section of the rule book. I just downloaded the 2014 Fastpitch and found the exact same wording.
EFFECT: Rule 7, Sec. 8 (a-d) The ball is dead. A strike is called on the batter for each foul ball, including the third strike. Baserunners must return to their bases without liability to be put out. Baserunner may not advance on a third strike foul ball, including a legally caught foul ball, however all runners may advance on any other legally caught foul ball.
What are you finding in what you are reading that is different? I agree it seems to be a slow pitch rule and hard to believe they would have that much different of a rule from every other rule set, but I am seeing it in 2 versions of the fastpitch book I have.
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