2 edits
Originally posted by Natural ScienceAfter 35.f5 g5 White has the simple 36.Rxd6 followed by Re6, which looks like a trivial win to me - either the pawns drop or White gets a protected passed pawn. Can't see any defence for Black here, or anything else after f5 (Rd7 drops the Qside, for example). But I may be missing something equally simple!
There's one thing missing from your appraisal of the position. How is White's king supposed to get into the Black position? And Black's pawn on e7 isn't "weak". Names like "backward" don't make a pawn weak; pawns are o ...[text shortened]... k? It can't be reached by the Black king, or either of the rooks.
(Edit: if Black plays 35...gf 36.gf the same threat of RxR still wins I think, but may be a bit trickier - e.g. 36...Kf7 37.RxR ef 38.Re6 Rd8 (38...Re7 is interesting, can't be bothered analysing what's happening after 39.Rxd6 Re1+ 40.Kf2 Ra1 but I think white should win this)