SITUATION 2: While in the set position, F1 has his pitching hand hanging straight down in front of his body, swinging back and forth, as he gets the sign from the catcher. RULING: This is not legal and is an illegal pitch or a balk if there are runners on base. While this “gorilla” stance is legal if the pitching hand is stationary, it is illegal if the arm is swinging back and forth. (6-1-3)
Emphasis added
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