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Subject: Re: One mate to solve for Champion!

Author: Uri Blass

Date: 08:37:27 06/16/01

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On June 16, 2001 at 08:50:27, Steven J. Brann wrote:

>On June 16, 2001 at 08:30:19, leonid wrote:
>
>>Hi!
>>
>>I am not sure how deep this position is but it look like that only strong
>>program will find it easy.
>>
>>[D]3K4/1Q1Q1Q2/Q1R1R1Q1/2N1N3/Q1qBNqQ1/q1qBRq1q/brnq1nrb/3kq3 w - -
>>
>>Please indicate your result.
>>
>>Thanks,
>>Leonid.
>
>Chessmaster 8000 finds the mate but it took longer than it usually does for your
>positions, 4:50 on a PIII 933.
>
>Time	Depth	Score	Positions	Moves
>0:00	1/3	19.45	52935		1. Nxc3+ Qcxc3 2. Rxe1+ Qxe1 3.
>					Bxc2+ Kc1 4. Bxc3 Rxg4 5. Bxb2+
>					Qxb2 6. Nxf3 Qhxf3
>0:27	1/4	27.23	2248065		1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3.
>					Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qdxd3+
>					Qed2 6. Nxf3 Qcxd3+ 7. Qgxd3
>1:19	2/5	30.51	6857417		1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3.
>					Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+
>					Rd2 6. Qdxf3+ Qhxf3 7. Qxf3+ Qee2
>					8. Nxc4 Qexf3 9. Qxc2+ Kxc2 10.
>					Qxa2
>4:50	2/6	Mate10	25540594	1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3.
>					Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+
>					Rd2 6. Qaxc2+ Qxc2 7. Qgxf3+ Qfxf3
>					8. Qdxf3+ Qxf3 9. Qxf3+ Qe2 10.
>					Qfxe2#
>8:43	3/7	Mate10	41570060	1. Nxc3+ Qaxc3 2. Rxe1+ Qxe1 3.
>					Bxc2+ Qxc2 4. Bxb2+ Nd3 5. Qgxd3+
>					Rd2 6. Qaxc2+ Qxc2 7. Qgxf3+ Qfxf3
>					8. Qdxf3+ Qxf3 9. Qxf3+ Qe2 10.
>					Qfxe2#
>
>Steve

I suspect that you should try to increase the value of the ss
parameter(selective search).

Using the default value is a mistake and I know that chessmaster6000 is usually
faster with ss=10 so I believe that the same is truth for chessmaster8000.

My experience tells me that with ss=10 I never see depthes like 2/5 or 3/7 but
only 1/5 and usually also 1/7 so I guess that you used the default ss=6.

Uri



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