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Originally Posted by BlueLawyer
Once upon a time I read an article in Referee magazine breaking down the Fed/OBR rules differences based, essentially, on four factors: (1) economics (metal bats); (2) safety (force play slide rule- although I think there is reasonable disagreement on whether that works); (3) time (run rule- 7 innings); and (4) participation (re-entry rule).
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There's also the reason of "umpire competence" -- and the obstruction rule fits this.