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

Author: Heiner Marxen

Date: 15:33:26 05/06/01

Go up one level in this thread


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.

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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