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

Author: leonid

Date: 05:02:49 01/27/01

Go up one level in this thread


On January 27, 2001 at 00:58:01, 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.
>
>Well, you askeed for it, didn't you?  According ot Chest, 5 moves solve it
>as a mate in 9 moves: nor one, not two... five.  I suspect, you did not
>really know the solution?!?!

Five solutions in one position is great! This is the other reason to like to use
it for possible verification. I actually created only this position with
selective search and looked if mate existe. When quick response went for 11
moves, I stopped right there. To solve it by brute force it could take more that
long time with my program. The best will be with laptop or computer in its
private room. Then no noise to desturb me in my sleep. My two laptops are very
slow to work. 80386 and 80486. My Pentium sleep with me in the same room and it
must stay there quiet all night.


>Nxf6+
>Nfxd6+
>Nbxd6+
>Q5xd5
>Qxe6
>
>Let me try to find something like a PV for everybody:
>
>Nxf6+ B7xf6  Nfxd6+ Bxd6  Q5xd5 Bde5  Rxc8   Na3+  Qxa3   Bg7   Bxd7+  Q6xd7
>Qfxf7+ Rxf7  Qfxf7+ Qxf7  Qxd7#
>
>Nfxd6+  Bxd6   Q5xd5 Be5   Nxf6+  B7xf6  Rxc8   Na3+   Qxa3   Bg7    Bxd7+
>Q6xd7  Qfxf7+ Rxf7  Qfxf7+ Qxf7  Qxd7#
>
>Nbxd6+  Bxd6   Nxf6+ B5xf6 Nxg7+ Bxg7  Qhxf7+ Q6xf7 Qxf7+  Bxf7  Bxd7+  Bxd7
>Qxe7+  Nxe7  Qxe7+  Bxe7  Qxd7#
>
>Q5xd5  Na3+   Qxa3 Qde5  Nxf6+  B7xf6 Bxd7+  Bxd7   Ng7+   Bxg7   Rxd8+  Qxd8
>Qhxf7+ Qxf7  Qfxf7+ Rxf7 Qfxf7#
>
>Qxe6  Nxd2+  Qdxd2 Bxe4+ Qfxe4  Qb2+  Qxb2   Qd1+  Qxd1   Qexe6 Nxg7+  Ke7
>Qxd7+  Rxd7  Qxe6+  Qxe6 Qxf8#
>
>This is, of course, a small extract of the 60000 lines solution output
>from Chest... ;-)

My program don't write in what way went search. For mate it is only possible to
ask the next solution (if it existe) after finding one.

>15.3 hrs, K7/600 with 350MB hash.  ;-)

Sound like very good time.

I look all the time on your impressive 350Mh. Not that many have so plenty of
memory like your computer.

Leonid.

>Heiner



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