I don't know, Pete. We use the straight OBR interpretation in Legion, Babe Ruth, and USSSA games, and in my opinion it's not a safety concern, nor is it that difficult to call with a large degree of consistency. Myself, I keep it simple when I have to make a call on a potential obstruction by looking at a couple of things.
I look to see if the fielder moved into a position in the basepath prior to the throw in order to field the ball to that spot. If so, I have obstruction if the runners progress is impeded. If, however, I feel the fielder had to move into the basepath in order to field an errant throw, I have nothing.
Tim.
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