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My question about the PDP comes from a book I am reading that discussed the PDP as an unwritten rule where the MLB players expected the umpires to call it due to the slide from R1 attempting to "take out" the thrower. Other books about the history of the game and rules describes the reason for players accepting the PDP being called is that umpires at the time seldom called interference.
One of the books is "Baseball by the Rules" by Glen Waggoner, Kathleen Moloney and Hugh Howard. Other information has been gleaned from articles off the internet and older rule books (circa 1950).
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