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Subject: Re: One very easy mate to solve.

Author: leonid

Date: 10:07:30 05/22/01

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On May 22, 2001 at 00:43:13, Pete Galati wrote:

>On May 21, 2001 at 21:17:24, leonid wrote:
>
>>Hello!
>>
>>I was not sure what position to chose between three close mate positions.
>>Decided to put the simplest one today and hardest one at the end, later.
>>
>>[D]RqqkqqR1/rBNbNBr1/QnqRqnQ1/bqBRBqb1/Q2K2Q1/8/8/8 w - -
>>
>>Please indicate your result.
>>
>>Thanks,
>>Leonid.
>
>I needed to load Junior6 on this computer cause I plan to use it in the near
>future for an interface to run Comet in the 60 minute per move against Mogens'
>Gandalf, so this is what Junior6 had to say:
>
>New position
>RqqkqqR1/rBNbNBr1/QnqRqnQ1/bqBRBqb1/Q2K2Q1/8/8/8 w - - 0 1
>
>Analysis by Junior 6.0:
>
>1.Q4xb5 Qf2+ 2.Kd3 Qd2#
>  -+  (-#3)   depth: 3   00:00:00  6kN
>1.Qc2 Qxg4+ 2.Bf4 Qg1+ 3.Qf2 Qxf2+ 4.Be3 Bxe3#
>  -+  (-45.84)   depth: 3   00:00:00  19kN
>1.Rxd7+ Nbxd7 2.Nxc6+ Qexc6 3.Bxf6+ Bxf6+ 4.Nxb5
>  -+  (-10.25)   depth: 3   00:00:00  91kN
>1.Nxe6+ Qxe6 2.Nxc6+ Qbxc6 3.Rxd7+ Nbxd7 4.Bxb8
>  -+  (-7.44)   depth: 3   00:00:00  99kN
>1.Nxe6+!
>  -+  (-7.14)   depth: 6   00:00:00  210kN
>1.Nxe6+ Qxe6 2.Nxc6+ Qbxc6 3.Rxd7+ Qe6xd7 4.Qxd7+ Nfxd7 5.Qgxc6 Rxa6 6.Bxc8
>  -+  (-5.65)   depth: 6   00:00:00  316kN
>1.Nxe6+!
>  -+  (-5.35)   depth: 9   00:00:01  1336kN
>1.Nxe6+! Qxe6 2.Nxc6+ Qbxc6 3.Rxd7+ Qe6xd7 4.Qxf6+ Bxf6 5.Qxd7+ Qc8xd7 6.Rxb8+
>Qcc8 7.Qxd7+ Nxd7 8.Rxc8#
>  +-  (#8)   depth: 9   00:00:04  3868kN
>1.Nxe6+ Qxe6 2.Nxc6+ Qbxc6 3.Rxd7+ Qe6xd7 4.Qxf6+ Bxf6 5.Qxd7+ Qc8xd7 6.Rxb8+
>Qcc8 7.Qxd7+ Nxd7 8.Rxc8#
>  +-  (#8)   depth: 9   00:00:04  4113kN
>
>It came up with that really fast and then just stopped searching.  63mb hash,
>the computer's 700mhz Celeron.

I am not that sure why program stopped searching but this position is quick
exceptional. In dispite of many heavy pieces on it, it have limited number of
moves and because of this is can be solved by every program. Many programs have
moves limit at 100. The most surprising was the time. At 7 moves brute force it
took only 16 sec. to say: "mate not found". In 8 move (brute force) mate was
found in only 0.32 sec.

Celeron 600Mhz. No hash.

Leonid.


>Pete



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