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

Author: Heiner Marxen

Date: 15:13:23 09/21/99

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On September 21, 1999 at 15:48:02, leonid wrote:

>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

Yes, that is meant by a "dual": the attacker has more than one move
to solve the position.  Problem composers always try to avoid a dual
in the posed position: such a problem would be considered wrong/buggy.
Sometimes problem composers try hard to avoid further duals down the
solution tree.

>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.

Aah, hrmm.  Now I start to be really curious about your "logic" for mate
solving.  I'd like to learn more about it.  Something I could read somewhere?

Heiner



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