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Subject: Re: If you like to find a mate...

Author: Pete Galati

Date: 20:03:46 01/18/01

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On January 18, 2001 at 22:21:05, leonid wrote:

>On January 18, 2001 at 22:06:37, leonid wrote:
>
>>On January 18, 2001 at 19:13:22, Paul wrote:
>>
>>>On January 18, 2001 at 19:01:08, Pete Galati wrote:
>>>
>>>>On January 18, 2001 at 18:44:05, leonid wrote:
>>>>
>>>>>Hi!
>>>>>
>>>>>If you would like to find a mate here is one position. It is very easy to solve
>>>>>but not that simple to find shortest mate.
>>>>>
>>>>>I failed here even in 3 hours to find shortest mate through brute force search.
>>>>>Maybe you will have better chance.
>>>>>
>>>>> 1k4q1/1pppPr2/PbbP1N1n/QP2rn1R/1q6/1q2RBB1/q1q2PPP/6NK black to go
>>>>>
>>>>>Leonid.
>>>>
>>>>Is this the right position?
>>>>
>>>>[D]1k4q1/1pppPr2/PbbP1N1n/QP2rn1R/1q6/1q2RBB1/q1q2PPP/6NK b - - 0 1
>>>
>>>If so, then mine says it's a mate in 10 for black starting with Nxg3+ ...
>>>It looks like a daily reverse auction ... Anyone lower, anyone? :)
>>>
>>>Paul
>>
>>Position is exact and response 10 moves must be or shortest possible, or very
>>close move. Actually my program solved this position through selective search in
>>11 moves. Solution was instant. Finding shortest mate is the other story.
>>Through brute force program said in 8 mate is not there. Only 9 still could be
>>looked.
>
>
>Mistake! My program solved this position not by 11 moves selective search but by
>10. Found this when I went to program and solved this position once again. My
>mistake came probably from the fact that I created today around 5 or 6 different
>positions. Few of them were solved by 12 and 11 moves. Only one, that I liked
>the most, I put here.
>
>Leonid.

I thought for a minute that the Chessbase native version of Comet had done it in
9 moves, but I was thinking, how could this be, but I took a closer look, and
what Comet was calling 9 moves was 10 moves to everyone else.  Oh well.

1...Nxg3+ 2.hxg3 Rxh5+ 3.Nxh5 Qh4+ 4.gxh4 Qxg2+ 5.Bxg2 Bxg2+ 6.Kh2 Ng4+ 7.Kg3
Qxe3+ 8.fxe3 Qf2+ 9.Kxg4 Qe6+ 10.Kg5 Qff5#
  -+  (-#9)   Depth: 8/37   00:12:17  187568kN

(Galati, ` 18.01.2001)

Pete



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