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

Author: Pierre Bourget

Date: 06:24:50 03/28/03

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On March 27, 2003 at 21:12:39, William Kerr wrote:

>[D]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.
>
>This position may have been posted before.
>
>
>Morphy run on a Great Game Machine 6502 at 2 Mhz
>Pocket Fritz 1.0 on a Cassiopeia E125  MIPS @ 150 Mhz
>All others run on a PC - PII 300, 256Mbytes Ram.
>
>The small m seen below stands for mate.
>
>cm9k 6:14 m11, 8:51 m6, 9:59 m4
>fritz532 3:21 m8 Nc3
>crafty no solve in 8 Min
>pocket genius 3 min no solve
>pocket fritz < 44 sec
>pocket grandmaster 6 min Ne3 +12.26 12/51
>yace < 7 min m11, 26:30 m4
>extreme 2:54 m6 16/34
>ruffian10 no solve 6 min
>Ruffian 101 > 6 min < 10 Min mate found
>doctor3 15 sec m4
>bringer 15 min no solve
>sargon4  5 sec m4
>rebel10 17 sec m6, 37 sec m4
>lg2kv2.7 10 min no solve
>uscf 5 sec
>wkchess 33 sec
>morphy 5:27
>
>Enjoy
>
>Bill

What is the source and author please .

Pierre



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