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In chess, a backward pawn is a pawn that is behind other pawns on adjacent files and cannot be defended by them. This pawn structure can be a weakness because it may be difficult to defend and can create vulnerable squares for enemy pieces.1

A passed pawn, on the other hand, is a pawn with no opposing pawns in front of it on its own or adjacent files. Passed pawns can become very powerful, especially in the endgame, as they can advance to promote to a more powerful piece.2

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