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Subject: Re: If you like to solve average mate position...

Author: Heiner Marxen

Date: 14:07:45 01/25/01

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On January 25, 2001 at 16:19:40, leonid wrote:

>On January 25, 2001 at 15:24:40, Heiner Marxen wrote:
>
>>On January 25, 2001 at 11:13:10, leonid wrote:
>>
>>>On January 25, 2001 at 10:57:06, José Antônio Fabiano Mendes wrote:
>>>
>>>>On January 25, 2001 at 09:57:29, leonid wrote:
>>>>
>>>>>Hi!
>>>>>
>>>>>If you like to solve some average mate position...
>>>>>
>>>>>[D]R1brkrnR/1N1qqqbN/3qqq1B/1B1bQNbQ/1bn1Q2B/3Q1Q2/3Q1Q2/1K6 w - -
>>>>>
>>>>>Please indicate your result.
>>>>>
>>>>>If you can depose here just one forced mate position from some world chess
>>>>>championship, it will be nice. Indicate exactly where this competition happened.
>>>>>I speak about championship where human found forced mate. Never mind if this
>>>>>championship was between two humans or man and machine. It could give an
>>>>>opportinity to see which program is best in real life situation. Even more that
>>>>>this, it will permit to tune selective search for forced mate to make it more
>>>>>effective.
>>>>>
>>>>>Thanks,
>>>>>Leonid.
>>>>
>>>>  As written the second row [1N1qqqb] accounts for only 7 squares,
>>>>  that's why the diagram is not displayed. JAFM
>>>
>>>Thanks for indicating mistake! I hope that now it will come in graphics. At list
>>>this time I will look if it is really there.
>>>
>>>Leonid.
>>
>>According to Chest there is no mate in 8 moves (41.6 min, K7/600 350MB hash).
>>What depth is expected for a solution?
>>
>>Ahem, what exactly is so "average" about this position?
>
>Hi, Heiner! I saw that this position could be solved with 11 moves or well
>below. Paul already said 10 moves as new maximum. You said that in 8, no mate
>for sure.

Hi Leonid!

I estimate 8 hours for depth 9, so I will omit that.
I'm currently running Paul's 15 positions.
Some appear to be also too deep for Chest.
I will report here, when I'm through.

>Position was average in my mind since it was not that endless position of 20 or
>30 moves deep, like I have seen here already few times. Number of initial legal
>moves from each side is moderate. Only white side reach slightly over 100 moves.
> Black have only few responses after initiation of hostilities.

Ah, I see.  But "average"?  With that many queens?
I consider 100 legal moves to be a huge number...
I remember that an early version of Chest was limited to 80 legal moves  ;-)

Heiner



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