The ending is a win for White, albeit not a simple win.
If it were Black's move, 1 ... Kf5 would draw> The main line is as follows:
2 b5 Rd3!
The only move that draws. Black's threat is Rd5, followed by Rb5(+).
3 Ka2 Rd5
4 Rb1 Ke5
Or 4... Ke6. Black gets within the "square" of the Pawn.
5 Ka3
If 5 b6 Ra5+, 6 Kb2 Rb5+, 7 Kc2, Rxc1, 8 Kxc1, Kd6 catches the pawn .
6 Ka3 Kd6
7 Ka4
7 b6 Kc6, 8 b7 Ra5+, 9 Kb3 Rb5+, 10 Kc2 Rxc1, 11 Kxc1 Kxb7.
7 ... Kc7
Black gets in front of the Pawn.
White wins by taking d3 away from the Rook.
1 Kc2! Kf5
The Rook has to stay on the third rank, in order to keep White's King from getting too near to the Pawn.
The other possibility is:
1.... Ra3
2 b5 Ra5
3 b6 Rc5+
4 Kd3 Rd5
5 Re6
The reason that 1... Kf5 would draw, if Black moved first, as now Re6 wouldn't be feasible.
5... Kf5
6 Kc4! Rb1
7 Rh6 Ke4
8 Kc5
and White will promote.
2 b5!
This is now possible, as d3 is covered.
2... Ra3
Black tries to approach from the other side of the Pawn.
3 b6 Ra6
3... Ra8, 4 Kc3 Rb8, 5 Rb1 Ke6, 6 Kc4 Kd6, 7 Kb5 (White keeps Black out of c6) Kd7, 8 Ra7 Rb7 (other moves also lose), 9 Kc6! Rb8, 10 Rb7. There are other lines, but White has just enough tempo to win.
4 Rb1 Ra8
5 b7 Rb8
6 Rb6!
White keeps Black off of the sixth rank.
6 .... Ke5
7 Kc3 Kd5
8 Kb4
Once again, White keeps Black away from the Pawn
8... Kd5
9 Ka5 Kd4
10 Ka6 Kc6
11 Ka7
(Edited to correct a typo and missing moves.)
Hey guys.The below given position looks like a simple rook endgame,doesn't it?(Just like any other instructive rook endgame!)But it's not so.In this position just one move can make white win.I find this position very instructive and I found it out on a chess magazine.The main reason I'am putting it infront of you is I myself have many doubts regarding this position that I want to share with you
people.I will post the solution soon(with my doubts!)