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Subject: Re: Nice trick

Author: Harald Faber

Date: 23:14:42 04/30/00

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On May 01, 2000 at 01:54:30, Ernst Walet wrote:

>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.


Depends on white's play. Try it out yourself to win with white and you'll see.
The white bishop is the problem.


>
>Analysis by Fritz 6:
>
>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



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