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Subject: Re: Very Tough Mate in 4 for Some Engines

Author: James T. Walker

Date: 18:18:28 03/28/03

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On March 27, 2003 at 23:22:18, Peter Berger wrote:

>On March 27, 2003 at 21:12:39, William Kerr wrote:
>
>>8/3p1p2/5Ppp/K2R2bk/4pPrr/6Pp/4B2P/3N4 w - - bm Nc3;id #1097 mate in 4
>>very-very tough;
>>
>>
>>Very tough mate in 4 for some engines.
>
>It is indeed. Many engines have a hard time, I wonder why.
>
>>yace < 7 min m11, 26:30 m4
>
>This surprised me. Did you use an older version of Yace here? I tried Yace
>Paderborn on my 486DX-50, 4 MB RAM and it needed about 19 minutes.
>
>8127562 19:12.7  Mat06 10++ 1.Nc3 e3 2.Ne4 d6 3.Rxd6H Bxf4H 4.gxf4H {HT}
>                               {30}
>8185987 19:17.5  Mat04 10t  1.Nc3 e3 2.Rb5 d6 3.Nd5 Bxf4H 4.Nxf4#H {-50}
>8278467 19:23.7  Mat04 10.  1.Nc3 e3 2.Rb5 d6 3.Nd5 Bxf4 4.Nxf4# {-50}
>
>So on your faster computer it should be a piece of cake.
>
>Peter

I tried both versions of Yace (0.99.56/Paderborn) and they both took 5 seconds
on my XP2400+



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