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

Author: Uri Blass

Date: 11:39:53 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?!?!
>
>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

Chessmaster6000 believes that white does not need the bishop at h4 to force mate
in 9.

Nxf6+ is enough to force mate in 9 without this bishop

Maybe reducing the number of pieces of white can force only one solution for the
mate in 9 problem.

Uri



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