1.Rb8+!
[1.Rd7?
h3
2.Rxd5
h2
3.Rd8+
Kh7!
4.Rd1
Rxf3+
-+; 1.Kg4?
h3!
2.Rb2
(2.Kg3
h2
-+) 2...Kf7
3.Rf2
(3.Kg3
Ke6
4.Re2+
Kd6
5.Rh2
d4
6.Rxh3
Kd5
-+) 3...Ke6
4.Kxh3
d4
5.Kg3
Kd5
-+] 1...Kf7
[1...Kh7
2.Kg4!
Ra4+
3.f4
Ra6
4.Kxh4
Rd6
5.Kg3
d4
6.Kf2
d3
7.Ke1
d2+
8.Kd1
Kg6
9.Rb5
(Rb7) =] 2.Rb7+
Kf8
Now everything is in order. White forced the black king to f8 and he can attack the pawn d5 3.Rd7!
[3.Kg4?
h3
4.Rd7
h2
-+; 3.Rb8+?
Ke7!
4.Rb7+
Kd6
-+] 3...Rxf3+
[3...h3
4.Rxd5
h2
5.Rd8+
Kf7
6.Rh8=
] 4.Kg4
Rd3
5.Kxh4
Rd1
[5...Rd2
6.Kh3!
Rd1
7.Kg2!
Rd4
8.Kg3!
etc.] 6.Kh3!
Rd2
7.Kh4!
[Thematic try 7.Kg3?
Rd4
zz 8.Kf3
Kg8!
zz 9.Ke3
Re4+
10.Kf3
Re5
11.Kf4
Rh5
12.Rd8+
Kf7!-+
(not 12...Kh7?
13.Rd6
and back to the main line) ]
7...Rd1
8.Kh3
Rd4
9.Kg3
zz [9.Kg2?
Rg4+
10.Kf3
Rg5
11.Kf4
Rh5
12.Kg4
g6-+
] 9...Kg8
10.Kf3
zz 10...Kf8
11.Kg3
positional draw, or 11...Kg8
12.Kf3
Kh7
13.Ke3
Rd1
14.Ke2
Rd4
15.Ke3
Re4+
16.Kf3
Re5
17.Kf4
Rh5
18.Rd6!
MAIN B [18.Kg4?
Kh6
19.Rd6+
g6-+
] 18...g6
[MAIN A 18...Kg8
19.Kg4
Re5
20.Kf4
Rh5
21.Kg4
positional draw with the perpetual attack on rook along the 5th rank] 19.Rd7+
Kh6
20.Kf3
(Kg3) 20...Rg5
21.Kf4
Rf5+
22.Kg4
Re5
23.Kf4
Re4+
24.Kf3
Rd4
25.Ke3
Rd1
26.Ke2
Rd4
27.Ke3
positional draw with the perpetual attack on rook along the 'd' file.