Tricky pawn endgame

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SmyslovFan

My first choice would be f4 here. b3-b4 is a waste of a tempo.  In K+P endings, you should save those sorts of pawn moves until they're necessary.

But I'd be surprised if 1.Kg2 didn't win.

SmyslovFan

Ok, so 1.Kg2? e5! probably draws. That means 1.f4 is the only way to win. Nice. Was this in Van Perlo's Endgame Tactics? It feels familiar.