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

Author: Heiner Marxen

Date: 21:58:01 01/26/01

Go up one level in this thread


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?!?!

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... ;-)

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

Heiner



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