White to Play - Win

1.Ra7 Bg8 2.Ra8 Bd5 3.Ra5 Bg8 4.Ra7 Bd5 5.Kd6+ Bf7 6.Ke5 Kh6 7.Kf6 Bg8 8.Ra8 Kh7 9.Ke7 Bd5 10.Ra5?! better is 10.Ra3 Bb3 11.Kf8 Kh6 12.f6! Kg6 13.Ke7 and this position is zugzwang as bishop moves allow Rg3+ followed by Rg1 with an easy win. 10...Kg7 Fine's variation has led nowhere as this is a repeat of the starting position. This time around Fine chose 11.f6+? Kg6! 12.Ra4 when he concludes Black is in zugzwang, but Black holds with 12...Bc4! preventing the check on the g-file. Black can put his bishop on the appropriate square for each positioning of the White rook. 13.Ra3 Bb3! 14.Ra6 Bf7! 15.Ra8 Bd5! 16.Ra7 Bg8! 17.Ra5 Bd5! The only other attempt is to try to use the king and rook to advance the pawn 18.Ra7 Bringing the king back doesn't do anything 18.Kd6 Bb3 19.Ke5 Kf7 is a draw even without the Black a-pawn as shown by del Rio in 1831 (BCE-474). 18...Bg8! 19.Kf8 Bd5 20.f7 Bc4! 21.Ra4 Kf6! 22.Ra7 Kg6! 23.Ra3 Kf6! 24.Rf3+ Kg6 25.Rg3+ Kf6 26.Rg1 Bxf7 27.Rf1+ Kg6 with a draw

Analysis using chess endgame tablebase.