True Brain Teaser

This puzzle, Zigman 1970, was first posted here in 2009. How does white win this position?

My first post...

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illyrialady
illyrialady

I suppose the only other thing to point out about this puzzle is the care which
White must take to avoid Stalemate. For instance,

  1. Qa3 Rxg6+ (Bxg6??)
  2. Kf2 Rf6+
  3. Kg3 Rg6+
  4. Kf4 Rf6+
  5. Ke5 g6
  6. Kxf6 Kxh7 *
  7. Bxg6+

If at any point in the main line, the White bishop does not block the Black rook
from checking on the Black's 8th-rank, then the Black rook keeps checking, and
if White takes it, the result is Stalemate. For instance,

  1. Qa3 Rc8
  2. Qe7 Rb8
  3. Bb3 Rc8
  4. Bc4 Rb8
  5. Bb5 Ra8
  6. Bc6?? Ra1+
  7. Kf2 Rf1+
  8. Kg3 Rg1+
  9. Kf4 Rf1+
  10. Kg5 Rg1+
  11. Kh4 Rh1+
  12. Bxh1 Stalemate

or

  1. Ke5 Re1+
  2. Kd6 Rxe7
  3. Kxe7 Stalemate
illyrialady
illyrialady

Yep. Stepping stones. Black can defend against the back rank mate. The only way to win is, while black is defending against the back rank mate, at the right moment, take the pawn on g7 with the Queen. But it must be done when the Black rook is en prise. That suggested Qa3 followed by Qe7, and then the White-bishop-Black-rook two-step dance brought a big grin to my face. Very good and artistic puzzle. You got any more as good, Yancey?

Alena
Alena

Thanks, Yancey. It's a very interesting puzzle. At first I thought I wouldn't solve it.
Here is the solution. I'm looking forward to your next puzzle.

1.Qa3 Rc8
2.Qe7 Ra8
3.Ba4 Rb8
4.Bb5 Ra8
5.Ba6 Rb8
6.Bb7 Rc8
7.Qxg7+ Kxg7
8.Bxc8 Kh8
9.Bf5 Kg7
10.h8=Q+ Kxh8
11.Kf2 Kg8
12.Kf3 Kf8
13.Ke4 Ke8
14.Kd5 Ke7
15.Ke5 Ke8
16.Kd6 Kf8
17.Ke6 Kg7
18.Ke7 Kh8
19.Kf6 Kg8
20.Be6+ Kh8
21.g7+ Kh7
22.g8=Q+ Kh6
23.Qg6#

illyrialady
illyrialady

You've really got to step up to this one.

Surpriselover
Surpriselover

I'm stumped.

Surpriselover
Surpriselover

Got to get some food...will try to solve this in a little bit.

Surpriselover
Surpriselover

Alright!



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