Quote:
Originally Posted by parrothead
However, if he has not committed toward 3B yet
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That's the key right there --not whether R1 leaves before or after F1 starts any move or anything else.
As a practical matter, it's very difficult for F1 to have in his head he's doing 3-1 and then switch his movements smoothly enough to make a throw to second.
Case 6.2.4: R1, R3. F1 stretches and comes set. He then swings his entire nonpivot foot behind the back edge of the pitcher's plate, steps toward second and (a) throws the ball to second in an attempt retire R1 who is advancing there or (b) feints a throw to second to drive R1 back to first, who has neither attempted nor feinted and advance to second. Ruling: in (a), this is legal. In (b) it is a balk.
(from the 2017 case book, so the number might be different.