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Subject: Re: Worlds toughest mate in 4

Author: Anthony Cozzie

Date: 17:56:30 10/16/03

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On October 16, 2003 at 19:10:46, Angrim wrote:

>On October 16, 2003 at 18:50:32, William Kerr wrote:
>
>>
>>Worlds toughest until someone finds a tougher one.
>>
>>After timing engines solving many mates in four, this one was by far the
>>toughest.
>>
>>[D] 8/3p1p2/5Ppp/K2R2bk/4pPrr/6Pp/4B2P/3N4 w - - bm Nc3;id #1097 mate in 4
>>very-very tough;
>>
>>This is a composed mate in 4 problem from Benko's Baffler's #1097.
>>
>>Most engines take a very long time to find the mate in 4.
>
>kidding? searching this on an Athlon 1.2ghz so somewhat more than 4x as fast
>as the hardware used below..
>proved that move d1e3 wins, 4 turns
>PN:206654 evals, 16499 expands, 16 max ply,  0.32 seconds real,  0.30 cpu

For engines with null-move pruning, this is a very tough position.

anthony

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