OBR and MLB have two types of obstruction, commonly named after the respective paragraphs describing them in the rule Mike posted above.
Type "A" obstruction- when a play is being made on the obstructed runner and the ball becomes dead- is described in paragraph 7.06(a).
Type "B" obstruction- when a play is not being made on the obstructed runner and is a delayed dead ball- is described in paragraph 7.06(a).
FED baseball is even different than OBR and softball. There you have only one type of obstruction, a delayed dead ball and a minimum of one forward base awarded.
Just another one of those sticky rules umpires have to keep separate if they work multiple sanctions.
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