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Subject: Re: Try to solve mate.

Author: leonid

Date: 06:47:21 09/14/02

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On September 14, 2002 at 09:26:25, leonid wrote:

>On September 14, 2002 at 08:51:31, Paul wrote:
>
>>On September 14, 2002 at 07:55:35, leonid wrote:
>>
>>>Hi,
>>>
>>>This mate is easy and only 9 moves deep:
>>>
>>>[D]bqRNNkqr/Q7/qPnPqBqN/Q4q2/5Qr1/5q2/5nQ1/bQqQqBKR w - -
>>
>>Hi Leonid,
>>
>>Pretz (p3/1000) also finds this one easy, it gets this in 3 seconds:
>>
>>00:03 WM9 06 Nxe6+ Qgxe6 Be7+ Nxe7 dxe7+ Qxe7 Qaxf5+ Bf6 Nxf6+ Qaxc8 Nh7+ Ke8
>>Qxg6+ Rxg6 Qgxg6+ Qf7 Qaxf7#
>>
>>>Still, maybe, You will be tempted for something more heavy and I this way will
>>>be able to find more on this position:
>>>
>>>[D]2qRQq2/p6P/q1BqqR1N/r6B/n1QNQQ1B/r6k/b1QKNP1q/bq4qn w - -
>>>
>>>On description of this mate I can see that it was solved by selective in 13
>>>moves but brute force search went not up to the end in order to find shortest
>>>move. Brute force search, without finding any mate, went only 9 moves deep.
>>
>>This one was indeed a lot more difficult, mine didn't fare so well here:
>>
>>06:49 WM11 07 Q8xe6+ Qdxe6 Qff3+ Rxf3 Qxf3+ Kxh4 Nhf5+ Rxf5 Nxf5+ ...
>>
>>So it found a mate in 11 in almost 7 minutes, with an incomplete pv ... these
>>d#*&#@rned hashtables ;) ... will have to think about this ... any tips anyone?
>>
>>>Please indicate Your result.
>>>
>>>Thanks,
>>>Leonid.
>>
>>Thanks for your mates as usual ...
>
>Thanks, Paul!
>
>Now I can see that second one is no far then 11 moves. I  can even put this
>position at 10 moves by brute force for night. If braching factor will not
>suddenly jump, then it should be enough time for me for finding its depth.
>
>First position have excellent time!
>
>Mine, on usual setting, found mate in 1.75 sec.
>
>Cheers,
>Leonid.

Paul, just after writing my message, I started to see second position in my file
to indicate 11 moves. When I finally found it (I not indicate before on what
page I had it), I looked that it was in reality solved by selected in 11 moves,
just as You said. Before upper part of page was covered with page keeper and it
is how I missed some additional description. If I knew this yesterday, when I
found this position, I could put search for 10 moves by brute force at night.

Selective in 11 moves was solved in 18 seconds. Usual setting.

Cheers,
Leonid.


>>Groetjes,
>>Paul



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