7R/5P2/1b5P/4K1k1/8/1p6/P7/5r2 w - - 0 1

# Can You Find The Winning Idea

There is a fundamental ending at the core of this problem that allows for a solution. Can you find it?

Comments

No. 1-3

1.f8=Q Rxf8

2.Rxf8 bxa2

3.Ra8 Kxh6

4.Kf5 Kg7

5.Rxa2 Kf7

The black king is not in the corner. It's impossible to win for white here.

Editor

And why does 1.f8(Q) fail to win in this case- it also reduces to a R vs B ending.

V-1

1.h7 Kg6

2.f8=Q Rxf8

3.Rxf8 bxa2

4.h8=N+ Kg7

5.Ra8 a1=Q+

6.Rxa1 Kxh8

7.Ra6 Bc5

8.Rg6 Bf2

9.Kf6 Kh7

10.Kf7 Ba7

11.Ra6 Bb8

12.Ra8 Bc7

13.Rc8 Bf4

14.Rc4 Bg3

15.Rc3 Bh4

16.Rh3 Kh6

17.Rxh4+

It's a winning position for white.

V-2

1.h7 bxa2

2.Rg8+ Kh6

3.h8=Q#