Good Morning Rook Endings
New York 1924 rd6
White to play
This is a well-known classical endgame where the 35.Kg3! was played
preparing ..b5 with queenside counterplay is deeply analyzed by Müller in Understanding Rook Endings(Gambit 2016)
36..Rf3 was the game continuation
It looks like the a-pawn will give some counterplay
What do you recommend for White?