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

Author: leonid

Date: 15:09:41 01/25/01

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On January 25, 2001 at 17:07:45, Heiner Marxen wrote:

>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.

Good! I already depose this position in my library. Now each created position I
can print when it is on the Chess Club site. Inside of my program I never wrote
graphics since I considered this as finalization of program. I am too far from
this. Some time money and very often absence of time limite my progress in
actual chess program.


>>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  ;-)

To be frank with you, this was usual positions for me when I wrote my first move
generator, around 7 years ago. I had then 200 moves limite. Now I see that it is
not enough. When I will rewrite for Linux, will put 300 moves limite. Somebody
here, few months ago, came with position that contained more that 200 moves.

Around 6 months ago I reached one side with forced mate positions where 9 queens
you could see more than often. Some italian site done in 1997. Then I started
regarding my beloved heavy positions as nothing shameful and even too damn
usual. Later I found on Internet even more places with forced mate densely
populated with equally pretty queens of both ethnic origin.

Leonid.

>Heiner



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