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Subject: Re: Nice trick

Author: Ernst Walet

Date: 22:54:30 04/30/00

On April 30, 2000 at 10:46:55, Harald Faber wrote:

>This position is a nice test of endgame knowledge for programs:
>
>Which program(s) avoid 1.Bxh7?? g5+!! 2.hxg6+ Kg7 3.Rg8+ Kh6 and draw, white has
>no chance to enter the black fortress.
>
>[D]7R/5kpp/8/7P/4BK2/8/8/3r4 w - - am Be4h7;bm Kf4e5 Kf4g3;id
>Sax-Kovacevic,Sarajewo 1982;

This is what Fritz6a analyses overnight after making the moves above.

[D]6R1/7B/6Pk/8/5K2/8/8/3r4 w - - 0 1

Still it sees a win for white.  Can you line out how the draw is achieved?

Ernst.

Analysis by Fritz 6:

4.Rh8
  +-  (4.47)   Depth: 1/3   00:00:00
4.Re8
  +-  (4.50)   Depth: 1/3   00:00:00
4.Ke5
  +-  (4.72)   Depth: 1/4   00:00:00
4.Ke5 Re1+ 5.Kf6
  +-  (4.84)   Depth: 2/6   00:00:00
4.Rc8
  +-  (4.88)   Depth: 2/6   00:00:00
4.Rc8
  +-  (4.88)   Depth: 3/3   00:00:00
4.Rc8
  +-  (4.88)   Depth: 4/4   00:00:00
4.Rc8
  +-  (4.88)   Depth: 5/5   00:00:00
4.Rc8
  +-  (4.88)   Depth: 6/6   00:00:00
4.Rc8
  +-  (4.88)   Depth: 7/7   00:00:00
4.Rc8
  +-  (4.88)   Depth: 8/8   00:00:00
4.Rc8
  +-  (4.88)   Depth: 9/9   00:00:00
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5
  +-  (4.91)   Depth: 10/21   00:00:00  47kN, tb=20
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5 8.Rc7 Rb5
  +-  (4.88)   Depth: 11/22   00:00:00  141kN, tb=56
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5 8.Rc7 Rb5
  +-  (4.88)   Depth: 12/23   00:00:01  367kN, tb=178
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5 8.Rc7 Rb5
  +-  (4.91)   Depth: 13/22   00:00:02  986kN, tb=590
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5 8.Rc7 Rb5
  +-  (4.84)   Depth: 14/24   00:00:05  2224kN, tb=1498
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5 8.Rc7 Rg5
  +-  (4.91)   Depth: 15/26   00:00:12  4918kN, tb=3597
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5 8.Kd4 Rb5
  +-  (4.91)   Depth: 16/29   00:00:24  9160kN, tb=7794
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5 8.Kd4 Rb5
  +-  (4.88)   Depth: 17/35   00:00:59  23072kN, tb=20687
4.Rc8 Rd5 5.Ke4 Rh5 6.Rf8 Rb5 7.Rf7 Rh5 8.Kd4 Rb5
  +-  (4.84)   Depth: 18/36   00:02:18  54209kN, tb=51950
4.Rc8 Kg7 5.Rc7+ Kh8 6.Rb7 Re1 7.Rb8+ Kg7 8.Kf5 Rf1+
  +-  (4.69)   Depth: 19/38   00:05:50  135232kN, tb=132983
4.Rc8 Kg7 5.Rc7+ Kh8 6.Rf7 Re1 7.Rf8+ Kg7 8.Ra8 Rf1+
  +-  (4.69)   Depth: 20/40   00:09:09  210818kN, tb=194542
4.Rc8 Kg7 5.Rc7+ Kh8 6.Rf7 Re1 7.Rf8+ Kg7 8.Ra8 Rd1
  +-  (4.69)   Depth: 21/40   00:15:22  367457kN, tb=324380
4.Rc8 Kg7 5.Rc7+ Kh8 6.Rc6 Kg7 7.Ke5 Re1+ 8.Kd6 Rd1+
  +-  (4.66)   Depth: 22/46   00:26:58  662965kN, tb=548779
4.Rb8
  +-  (4.69)   Depth: 22/46   00:28:53  711819kN, tb=578318
4.Rb8 Kg7 5.Rb7+ Kh8 6.Rb6 Rg1 7.Rb5 Rd1 8.Rc5 Rh1
  +-  (4.66)   Depth: 23/47   02:12:39  3431667kN, tb=2701619
4.Rb8 Kg7 5.Rb7+ Kh8 6.Rb6 Rg1 7.Rb5 Rd1 8.Rc5 Rh1
  +-  (4.66)   Depth: 24/45   03:07:35  4869021kN, tb=3635486
4.Rb8 Kg7 5.Rb7+ Kh8 6.Rb6 Rg1 7.Rb5 Rd1 8.Rc5 Rh1
  +-  (4.66)   Depth: 25/46   05:32:03  8647286kN, tb=6198360

Remove the pawn and TBs show the draw !!! Laurence Chen 13:26:25 05/01/00
- Re: Remove the pawn and TBs show the draw !!! KarinsDad 15:09:03 05/01/00
  - Re: Remove the pawn and TBs show the draw !!! Laurence Chen 16:51:05 05/01/00
    - Re: Remove the pawn and TBs show the draw !!! KarinsDad 19:38:08 05/01/00
Re: Nice trick blass uri 23:59:08 04/30/00
- Re: Nice trick Ernst Walet 08:26:48 05/01/00
  - Re: Nice trick blass uri 08:33:52 05/01/00
  - Re: Nice trick Harald Faber 08:32:44 05/01/00
Re: Nice trick Harald Faber 23:14:42 04/30/00
Re: Nice trick Ernst Walet 22:56:22 04/30/00

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