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Subject: Re: number of moves in position (problem solution)

Author: leonid

Date: 12:48:02 09/21/99

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On September 21, 1999 at 11:13:51, Heiner Marxen wrote:

>On September 20, 1999 at 20:07:30, leonid wrote:
>
>>
>>For those who really like some big number of moves in one position. One of
>>my old positions for solving the mate. White have 113 moves and make
>>mate in 5.
>>
>> -------------------------------------------
>> |    |    |    |    |    |    |    |    |8
>> |    |    |    | *R |    | *Q | *K | *Q |
>>--------------------------------------------
>> |    |    |    |    |    |    |    |    |7
>> |    |    |    |    |    |  *Q| *Q | *Q |
>>--------------------------------------------
>> |    |    |    |    |    |    |    |    |6
>> |    |    |    |    |    |    | *Q |    |
>>--------------------------------------------
>> |    |    |    |    |    |    |    |    |5
>> |    |    |  N |    |    | *R |    |    |
>>--------------------------------------------
>> |    |    |    |    |    |    |    |    |4
>> |    |    |    |    |    |    |    |    |
>>--------------------------------------------
>> |    |    |    |    |    |    |    |    |3
>> |  Q |  Q |  Q |  Q |  Q |  Q |  Q | Q  |
>>--------------------------------------------
>> |   B|    |    |    |    |    |    |    |2
>> |    |    |    |    |    |    |  Q |    |
>>--------------------------------------------
>> |    |    |    |    |    |    |    |  K |1
>> |    |    |    |    |    |    |    |    |
>>--------------------------------------------
>>
>> * - black color.
>>
>>Position created in 1996.
>
>FEN: 3r1qkq/5qqq/6q1/2N2r2/8/QQQQQQQQ/B5Q1/7K w - -
>
> Qxf7+ Q6xf7 Bxf7+ Qfxf7 Qxd8+  Qe8    Qaa2+  Rf7    Qfxf7#
>
>It is not free of duals, but it is not supposed to be so, right?
>The key move Qxf7+ is unique.
>
>Heiner
>

I don't know if I understood correctly but if you wanted say that few
moves can lead to the mate in the same position, I agree. I don't know
exactly for this one but many have. When I want to see if few moves leading
to the mate existe I ask the logic to find them all. Here logic said that mate
existe in 5 moves. If some logic will find mate before this number it is
buggy.

Leonid.





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