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Subject: Re: "avoid move" position

Author: Dieter Buerssner

Date: 14:10:26 05/12/03

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On May 12, 2003 at 16:51:09, Jon Dart wrote:

> 7r/4k3/5bRP/5P1P/5K2/8/8/8 w - -
>Crafty does not ever want to play Rg7+, but in analysis mode, it takes a long
>time to see that this is not a good move:

I cannot understand this. Crafty does not want to play it, but shows it in
analyse mode?

>               16->   2:03   0.00   135. Rg7+ Bxg7 136. hxg7 Ra8 137. Kg5
>                                    Kf7 138. f6 Ra1 139. Kf5 Rg1 140. h6
>                                    Rf1+ 141. Kg4 Rxf6 142. Kh5 Rxh6+ 143.
>                                    Kxh6 Kg8 144. Kg5 Kxg7
>               17     2:03     --   135. Rg7+
>               17     5:37  -1.95   135. Rg7+ Bxg7 136. hxg7 Ra8 137. Kg5
>                                    Kf7 138. f6 Ra2 139. Kg4 Rg2+ 140.
>                                    Kf5 Rg1 141. h6 Rh1 <HT>
>               17->   5:37  -1.95   135. Rg7+ Bxg7 136. hxg7 Ra8 137. Kg5
>                                    Kf7 138. f6 Ra2 139. Kg4 Rg2+ 140.
>                                    Kf5 Rg1 141. h6 Rh1 <HT>
>

Yace does not want to play this move. I may depend a bit on the setup (for
examples which TBs are available). If I force Rg7, I see Mate in 28 for black
rather soon:

1...Bxg7 2.hxg7 Rd8 3.Kg5 Kf7 4.f6 Rd2 5.Kf4
Rg2 6.Kf5 Rg1 7.h6 Rh1 8.Kg5 Rh2 9.g8=Q+ Kxg8
{EGTB} 10.Kg6! Rg2+ 11.Kf5! Kf7! 12.h7 Rh2!
13.Kg5 Rxh7! 14.Kf5! Rh8 15.Ke5 Rd8! 16.Kf5!
Re8! 17.Kg5! Re6 18.Kf5! Re1! 19.Kg5 Rf1!
20.Kg4! Kxf6 21.Kg3! Rf5 22.Kg4 Kg6! 23.Kh4
Rg5! 24.Kh3 Kh5! 25.Kh2 Kh4! 26.Kh1 Kg3! 27.Kg1
Rf5! 28.Kh1 Rf1#! {500}

Regards,
Dieter



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