Why does white not try holding on to this pawn?

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EliasAStern

This game is from a book I was looking at. The game is T.Nedev-A. Yusupov.  In this position white played Rdd1. Why didnt he try to hold on to the pawn with Rde5? Shredder seems to think that white ends up losing the pawn anyways after some Nd4 buisiness. Why is this? Thanks, Elias

cschess

Yes, the pawn likely cannot be held in any case, and White avoids any chance of his rook getting trapped or caught out of good position.