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Subject: Re: Two mate positions to solve.

Author: leonid

Date: 08:25:24 09/06/00

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On September 05, 2000 at 06:12:14, Larry Griffiths wrote:

>On September 02, 2000 at 17:08:20, leonid wrote:
>
>>Hello!
>>
>>Please solve these two positions and say minimum number of moves that lead to
>>it.
>>
>> 1r2k2r/1b3pbp/1NPqN1n1/1P1Q4/1P2P3/P3B3/5PP1/R3KB1R White to go.
>>
>> 6KQ/3B2Q1/QQQQQQQ1/5Nbn/qqqqq1q1/5qqk/8/8 White to go.
>>
>>It will be good if you will indicate all main parameters of your trial. At
>>least, I see them this way:
>>
>>Name of your program. Hash table size.
>
>Dont have a name yet, Hash table is 4 meg.
>
>>In what way (if you know) position was solved. Selective search or brute force
>>search.
>
>Selective Search.
>
>>Time for each way of search.
>
>00:00:23.375  2 -            9000   Nxd4 Bxf6  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
>00:00:31.672  2 -        88888872   Qxg3 Qxg3 Qxh5 Qxh5 Nxd4 Qxe6 Bxe6 Qxe6  ?
>?  ?  ?
>00:00:52.235  2 -        88888872   Qxg3  <----------
>
>52 seconds for position 2.  My principle continuation is a little messed up
>right now but it might be 16 plys deep.
>
>>CPU and its speed.
>>
>>If you could come with some of your "crazy" (fantasy) position or normal one, it
>>will be good. When you will depose your, try to make them between 5 and 9 moves
>>mate. That deep you still can expect reasonable time to be solved by brute force
>>on our computers.
>>
>>Thanks in advance,
>>Leonid.
>
>Larry.

Your time is pretty good and mainly on a position that can kill few programs.

If you could indicate what kind of searcher you used, it will be good. Some kind
of specialized one that is independent in your program? Like mate solver, or you
have some kind of solver in the variation that, probably, is called "check
extension"?

What usual difference in time of search hash table represent? Never mind for
this position or in general. Even if you want, just indicate some mate
containing position with different time that it can take.

Thanks in advance,
Leonid.



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