OBR does not specifically mention a turn of the shoulders but according to what we were taught at umpire school, the turn of the shoulders is certainly a motion associated with a pick off move. I've never witnessed a right handed P throw to 1st without turning his shoulder. So from what I interpret and have been taught, it is a balk in OBR. Now, how they actually handle it at the MLB level is a different story but they were real clear in stating that the shoulder turn is a balk.
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