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Subject: Re: One mate in 11.

Author: Uri Blass

Date: 10:19:53 09/07/02

Go up one level in this thread


On September 07, 2002 at 12:38:44, John Merlino wrote:

>On September 07, 2002 at 12:27:51, leonid wrote:
>
>>Hi,
>>
>>Try to solve this mate:
>>
>>[D]1q4q1/PPk2qNq/1RPqbQ1n/2PRP2q/q2Nn2P/3Qq2r/3bq2B/r2BQ2K w - -
>>
>>Please indicate Your result.
>>
>>Thanks,
>>Leonid.
>
>Chessmaster 9000 announces Mate in 11 in 54 seconds on a PIII-733. The funny
>thing is that all PVs before that show Black with a clear victory!


The same is for movei(p850 ,32 Mbytes hash)

I decided to give it to movei after reading your post because I knew that this
means that movei has good chances to find the mate.

It may not extend checks when the side to move has big advantage but it extends
checks when the opponent has big advantage.
>
>Time	Depth	Score	Positions	Moves
>0:02	1/3	-25.42	93586		1.exd6+ Nxd6 2.Ngxe6+ Qexe6 3.Nxe6+
>					Qexe6 4.axb8=Q+ Kxb8
>0:07	1/4	-22.59	347630		1.exd6+ Nxd6 2.Ngxe6+ Qexe6 3.Nxe6+
>					Qexe6 4.axb8=Q+ Kxb8 5.Qfxe6 Qxe6
>					6.Qxe6 Qxe6 7.Qxh7 Qexd5+ 8.Kg1
>0:10	1/4	-17.18	474480		1.Ngxe6+ Qfxe6 2.exd6+ Nxd6 3.Nxe6+
>					Qexe6 4.Qxh7+ Nf7 5.axb8=Q+ Qxb8
>					6.Bxe2 Qxf6
>0:17	1/5	-16.79	853509		1.Ngxe6+ Qfxe6 2.exd6+ Nxd6 3.Qxh7+
>					Nf7 4.Nxe6+ Qxe6 5.a8=N+ Qbxa8
>					6.cxd6+ Kxb6 7.bxa8=N+ Qgxa8 8.Qb2+
>					Bb4 9.Qbxb4+ Qxb4 10.Qxb4+ Kxc6
>0:54	1/6	Mate11	2919084		1.Ngxe6+ Qfxe6 2.exd6+ Nxd6 3.Nxe6+
>					Qexe6 4.cxd6+ Kxb6 5.Qb2+ Kxa7
>					6.Qbd4+ Qxd4 7.Qxd4+ Ka6 8.Bxe2+
>					Qhxe2 9.Qexa1+ Ra3 10.Qxa3+ Ba5
>					11.Qxa5#
>
>jm

It finds the mate after slightly more than 3 minutes
Here are the sscores in the last iteration(the score jumped from 17 pawns for
black to mate)

5 -1701 14588 12913120 g7e6 f7e6 e5d6 e4d6 d3h7 h5f7 a7b8b g8b8 d4e6 e3e6 h7f7
h6f7 e1e2 e6f6 d5d2 h3h4
6 9979 20146 18097715 g7e6 f7e6 e5d6 e4d6 d4e6 e3e6 c5d6 c7b6 f6b2 b6a7 d3d4
a4d4 b2d4 a7a6 d1e2 h5e2 e1a1 h3a3 a1a3 d2a5

Uri



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