I'm currently studying chess strategy, and I can across an example of backward pawn exploitation that I do not understand. The book I'm reading suggests 1... Rd5 to keep the d4 pawn backward. Doesn't that put the rook into a precarious position to be attacked by 2. Bxd5? Why is it so valuable to keep the d4 pawn backward?
For reference, I'm looking at the example on pg. 236 of Silman's "Reassess Your Chess", 4th edition.
[Title "Black to move"] [StartFlipped "1"] [fen "3r1rk1/1pb2pp1/p1p1pq1p/2P2b2/3PBP2/PPB5/2Q3PP/4RRK1 b KQkq - 0 0"] 1...Rd5