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

Author: leonid

Date: 20:15:16 05/06/01

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On May 06, 2001 at 18:33:26, 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#
>
>Ok, here arrives the artillery:
>
>After 4.3 hours on K7/600 with 350 MB hash Chest mutters "No solution in 8
>moves."  And because of the following timing:
>
>depth  seconds
>#  3      0.03  0.96        104-         0
>#  4      0.28  1.06       1135-         0
>#  5      2.53  1.18       9900-         0
>#  6     52.20  1.30     157103-         0
>#  7    837.84  1.55    2855222-       699
>#  8  15562.53  1.65   49837105-  41089204
>
>15562.53 / 837.84 = 18.574
>
>I will stop here, and not invest another 4.3 * 18.574 = 79.868 hours,
>or 3.327 days.  Ok?
>
>We now know, that it is a mate in 9, we are just not sure whether there are
>more key moves to solve the mate in 9.

Thanks, Heiner! Always very appreciated. By knowing for sure that this is mate
in 9, I can put later brute force to search for it. It could be very useful for
me when I would need to see the time difference between two different versions.
It could be all time used as position for verification for bugs by everybody.

Have a good night!
And for you as well, Paul.

Leonid.




>
>Aah, and yet again: Pretz found the shortest line, Paul!  And Chest did not!
>Praise to Pretz!
>
>Well, that was enough chess problem solving for a weekend.  Was fun!  :-)
>A nice next week to all!
>
>Heiner



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