Author: leonid
Date: 17:12:09 05/02/01
Go up one level in this thread
On May 02, 2001 at 16:24:15, Paul wrote:
>On May 02, 2001 at 16:15:41, leonid wrote:
>
>>On May 02, 2001 at 12:54:56, Paul wrote:
>>
>>>On May 02, 2001 at 11:58:03, leonid wrote:
>>>
>>>>Hi!
>>>>
>>>>If you want to solve some mate that is completely moderate, then this is one.
>>>>Position is not very simple but have nothing of deep or complicated. It stay
>>>>just in middle.
>>>>
>>>>[D]qQR1qQrk/1r1qQqqn/3N1nbn/1Q2qQNR/3Q4/bq3q2/QBB2Q1Q/K7 w - -
>>>>
>>>>Please indicate your result.
>>>>
>>>>Thanks,
>>>>Leonid.
>>>
>>>Hi guys!
>>>
>>>Pretz just found a mate in 10 ...
>>>
>>>10:36 WM10 09 Ndxf7+ Bxf7 Nxf7+ Qbxf7 Qxg8+ Qfxg8 Qxg8+ Qgxg8 Qfxf6+ Qfxf6
>>>Qfxf6+ Qxf6 Qdxf6+ Nxf6 Bxf6+ Qg7 Rxe8+ Qxe8 Q5xe8#
>>>
>>>Could become shorter with longer thinking time though ...
>>
>>Hi!
>>
>>And by what way you found 10 moves deep? By brute force (perfect search that see
>>everything) or selective (quick)?
>>
>>Salut,
>>Leonid.
>
>I only have a selective search ... so that's what I used this time. :)
>
>Well ... of course I can switch off nullmove, all extensions ... etc, but that
>really won't cut it. You need some clever stuff to make a frute force search
>fast, and I haven't got that ... but that's what we've got Heiner for. ;)
I asked you this because I expected that this time you went by brute force since
this position is 10 moves deep. So, your result is 100% right. You have good
program!
This position happened to have very accessible branching factor for brute force.
To my surprise, it took only 38 min 25 sec to say that mate in 9 do not existe.
With hash at work it could be even shorter.
I solved this position, just like you, by 10 moves selective search.
Paul, do you have, by accident, Web address of Genius 2 ("free Uri's version).
Something happened to mine when I wanted to see this position on Genius 2. I use
Genius 2 (Genius 4 I have) because I remember that it was without any bugs in
mate solving and because Rebel 10 have limit of 100 moves. Meantime, will try to
see if address is still here in Chess Club old pages.
Salut,
Leonid.
>Groetjes,
>Paul
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