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Subject: Re: One mate to solve... that now is very easy.

Author: leonid

Date: 12:17:28 05/06/01

Go up one level in this thread


On May 06, 2001 at 13:26:26, Heiner Marxen wrote:

>On May 06, 2001 at 11:55:05, Paul wrote:
>
>>On May 06, 2001 at 10:13:27, leonid wrote:
>>
>>>On May 06, 2001 at 06:22:26, leonid wrote:
>>>
>>>>Hello!
>>>>
>>>>If you would like to solve a mate, you can try this moderate position:
>>>>
>>>>[D]Qqrkrq1Q/1QqqqqQ1/qBbnnbBq/1NQ2QN1/8/2Q2Q2/3RR3/3K4 w - -
>>>>
>>>>Please indicate your result.
>>
>>Ok ... my guess, before Heiner moves in with his heavy artillary, a mate in 9:
>>
>>06:18 WM9 09 Bxc7+ Qbxc7 Qxc7+ Qxc7 Qxd6+ Qcxd6 Nxe6+ Qexe6 Qfxf6+ Re7 Rxd6+
>>Qxd6+ Qxd6+ Bd7 Qhxf8+ Qxf8 Qcc7#
>
>Well, 6:18 is not exactly fast, right?
>I will try this one later, have started with the second one.  See below.
>
>
>>>>Thanks,
>>>>Leonid.
>>>
>>>After sending this last position I went to see its branching factor on one
>>>professional program. I took it recently from the Web. After thinking for a
>>>while program stopped breathing. Sudden death. Then I felt me a little bit
>>>guilty by presenting upper position for Sunday. Better will be the next one that
>>>is really. I did it yesterday before comming to the position that is above.
>>
>>No ... it wasn't too hard, Leonid! You must really be a nice guy, thinking about
>>our feelings like that, thanks! ;)
>
>The one who tortures us daily with bizarre mate problems?  :-))
>
>But seriously: if they are too hard, he will not get much helpful response.
>OTOH, we may feel pressed to improve our programs...
>
>
>>>[D]nqrkrqn1/1QqnnqQ1/1BnbbnB1/BQNNNNQB/8/8/3RR3/3KQ3 w - -
>>>
>>>Please indicate your result.
>>>
>>>Thanks,
>>>Leonid.
>>
>>This one's a bit too easy, haha, found a mate in 6:


Thanks, Heiner! I see now that this mate is very helpful to keep. It is not
every position that can contain 6 responses.

Salut,
Leonid.



>>
>>00:04 WM6 06 Qxc7+ Nxc7 Nxd6 Nxa5 Qxd7+ Nxd7 Nc6+ Nxc6 Ncb7+ Qxb7 Nxb7#
>
>For sure it really is a mate in 6:
>ChestMate = Pretzmate /* -1 */;		/* bugfix by Heiner */
>
>It has multiple solutions, there are 6 key moves:
>
>Bxc7+ Nxc7  Qxc7+  Bxc7  Bxf7   Bxd5  Nxc6+  Nxc6  Rxe8+  Qxe8  Qxe8#
>Bxf7  Nxc5  Nxc6+  Nxc6  Q7xc6  Bd7   Rxe8+  Bxe8  Qexe8+ Qxe8  Qxe8#
>Nxc7  Bb3+  Qxb3   Nxc7  Nxc6+  Nxc6  Qbxf7  Nce5  Qxd7+  Nxd7  Qxd7#
>Nxd6  Naxb6 Q7xb6  Nxa5  Nexf7+ Bxf7  Nf4    Bb3+  Qxb3   Ne5   Ndb7#
>Qxc7+ Nxc7  Bxc7+  Bxc7  Bxf7   Bxd5  Nxc6+  Nxc6  Rxe8+  Qxe8  Qxe8#
>Qxf7  Qxf7  Nxf7+  Bxf7  Nxd6   Nde5  Nxf7+  Nxf7  Nxc7+  =*=   N7e6#
>
>That took 28.4 minutes (!) (K7/600, 350MB hash)
>
>depth  seconds
>#  3      0.15  0.99        386-         0
>#  4      4.19  1.25       9199-         0
>#  5     95.47  1.55     219507-         0
>#  6   1704.26  1.86    4219473-      9977
>
>Chest needed an average of 2.5 black moves to refute at the top level,
>what is unusually large, and contributes to the comparatively large time.
>
>>Have a nice Sunday,
>>Paul
>
>Thanks!  Dito!
>Heiner



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