1.Rb3!
[1.d7?
Nf7
2.Rb3
Bg3!
(2...Ba7+?
3.Kf4
h2
4.Kg3
h1N+!
5.Kf4+-
; 2...Bh2?
3.d8Q
Nxd8
4.Kf3
Ke1
5.Re3+
Kd1
6.Rd3+
Kxc2
7.Rxd8+-
) 3.Ng7
(3.Kf3
Be1
4.Re3
h2
5.Rxe1+
Kxe1
6.Kg2
Kd2=
) 3...h2
4.Rb1+
Kg2
5.Nf5
Bf2+
6.Ke2
Nd8
7.Rf1
Bg1
8.Rf4
h1Q
9.Rg4+
Kh3
10.Rh4+
Kg2
11.Rxh1
Kxh1
12.Nxe7
Kg2=
] 1...Bxd6
[1...h2
2.d7
Ba7+
3.Kf4
Nf7
4.Kg3
h1N+
5.Kf4
Nf2
6.Kf5+-
] 2.Kf3
Ke1
3.Nxd6
exd6
4.Kf4!
[4.Ke4?
Ng4
5.Rxh3
Nf2+=
; 4.Kg3?
Nf5+
5.Kxh3
Kd2=
] 4...Kd2
[4...Nf7
5.Rxh3
main line] 5.Rxh3
[Thematic try 5.c4?
Nf7!
(5...h2?
6.Rh3
Nf7
7.Kf5!
Ne5
8.c5!+-
) 6.Rxh3
Ne5
7.c5
Ng6+!
8.Kg5
dxc5
9.Kxg6
c4
10.Kf5
c3
11.Ke4
c2
and draw (compare with the main line where is blocked c2 by bK)] 5...Nf7
6.c3!!
zz [6.c4?
Ne5
and as in the thematic try] 6...Kc2
[6...d5
7.Rh5
Kxc3
8.Rxd5
Kc4
9.Rd7+-
] 7.c4
[7.Kf5?
d5!
(7...Ne5?
8.Ke4+-
) 8.Kf6
Nd6
9.Ke5
Nb5=
] 7...Ne5
8.c5
Ng6+
9.Kg5!
dxc5
10.Kxg6
c4
11.Kf5
c3
12.Ke4
and wins because is blocked c2.