Reasons
The advance of the passed pawn lengthens the range of a rook behind and reduces the range of a rook in front. A rook escorting a pawn from ahead must move off, potentially leaving the pawn undefended, if it is to promote. A rook behind an enemy passed pawn can more readily generate counterplay.
Read more about this topic: Tarrasch Rule
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—Virgil [Publius Vergilius Maro] (70–19 B.C.)
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