Ambidextrous Pitcher Question

Originally Posted by cshs81

I read a report of a pitcher for a college (Creighton maybe) who is ambidextrous. I had heard that he must choose which hand he is going to throw with either a)at the beginning of the inning or b)before the first pitch to a batter.

However, I can't find the rule that states that. I looked in OBR but do not have access to FED/NCAA.

Did I miss it in OBR?

FED 6-1-1

ART. 1... The pitcher shall pitch while facing the batter from either a windup position (Art. 2) or a set position (Art 3). The position of his feet determine whether he will pitch from the windup or the set position. He shall take his sign from the catcher with his pivot foot in contact with the pitcher's plate. The pitching regulations begin when he intentionally contacts the pitcher's plate. Turning the shoulders to check runners while in contact with the pitcher's plate in the set position is legal. Turning the shoulders after bringing the hands together during or after the stretch is a balk. He shall not make a quick-return pitch in an attempt to catch a batter off balance. The catcher shall have both feet in the catcher's box at the time of the pitch. If a pitcher is ambidextrous, the umpire shall require the pitcher to face a batter as either a left-handed pitcher or right-handed pitcher, but not both.