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Subject: Re: Difficult Mate Solved?

Author: Heiner Marxen

Date: 13:50:04 01/21/02

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On January 21, 2002 at 15:25:55, Joshua Lee wrote:

>New game
>[D] 3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w - - 0 1
>
>Analysis by Fritz 7:
>
>1.e4!
>  +-  (28.97)   Depth: 8/17   00:00:00  103kN
>1.e4 Qd4 2.Qh5+ Kf8 3.Qf5+ Kg7 4.f4 Qa4 5.Qe5+ Kg8 6.Kf2 Qxc2
>  +-  (29.04)   Depth: 8/19   00:00:00  240kN
>1.e4!
>  +-  (29.32)   Depth: 9/19   00:00:01  390kN
>1.d4!
>  +-  (29.35)   Depth: 9/21   00:00:05  1320kN
>1.d4!
>  +-  (29.63)   Depth: 10/21   00:00:07  1760kN
>1.d4!
>  +-  (29.91)   Depth: 10/23   00:00:10  2790kN
>1.e4!
>  +-  (29.94)   Depth: 10/24   00:00:14  4134kN
>1.e4!
>  +-  (30.10)   Depth: 10/24   00:00:14  4278kN
>1.e4 Qa5 2.Qg4 Kf8 3.Qf5+ Qxf5 4.exf5 Kg7 5.d4 Kf6 6.g4
>  +-  (30.19)   Depth: 10/25   00:00:18  5539kN
>1.e4!
>  +-  (30.47)   Depth: 11/25   00:00:21  6351kN
>1.e4!
>  +-  (30.75)   Depth: 11/25   00:00:23  7063kN
>1.e4!
>  +-  (31.04)   Depth: 12/27   00:00:29  9091kN
>1.e4!
>  +-  (31.32)   Depth: 12/27   00:00:36  11623kN
>1.e4!
>  +-  (31.88)   Depth: 12/27   00:00:40  13218kN
>1.e4 Qa5 2.Nc3 Kd8 3.Qg4 Kc7 4.Nd5+ Kb8 5.Qg8+ Kb7 6.Bb5 Qxb5 7.Qf7+
>  +-  (33.57)   Depth: 12/30   00:01:30  30984kN
>1.e4!
>  +-  (33.85)   Depth: 13/29   00:01:52  38712kN
>1.e4!
>  +-  (34.13)   Depth: 13/29   00:01:56  40156kN
>1.e4!
>  +-  (34.69)   Depth: 13/29   00:02:05  43448kN
>1.e4 Ke7 2.d4 Qd6 3.Qh5
>  +-  (37.63)   Depth: 13/32   00:04:45  99463kN
>1.e4 Ke7 2.d4 Qd6 3.Qh5
>  +-  (37.72)   Depth: 14/33   00:08:17  174386kN
>1.e4!
>  +-  (38.00)   Depth: 15/35   00:12:36  266115kN
>1.e4!
>  +-  (38.29)   Depth: 15/37   00:16:40  351064kN
>1.e4!
>  +-  (38.85)   Depth: 15/37   00:19:56  418816kN
>1.e4 Qa5 2.Nc3
>  +-  (#83)   Depth: 15/39   03:52:39  4982616kN
>1.e4 Qa5 2.Nc3
>  +-  (#83)   Depth: 15/39   03:59:44  5139568kN
>
>(Lee, Pensacola,FL 21.01.2002)
>
>For some strange reason though Fritz 7 stoped listing the time in the engine
>window but still lists the time at the bottom of the screen
>It's hard to be 100% sure if this is the best line but it is the only mate found
>in this position that i have heard of.

This is Test#91 from Valentin Albillo:
http://www.multimania.com/albillo/ajedre9a.htm

It is supected to be a mate in 12.  If that is true, it is still out of reach
for Chest (extrapolated 1 month on an Athlon 1500+).
As far as I know, there is no complete forced mate known, besides the one
you show us.  But #83?  Isn't that a bit deep?
That would indeed be very interesting.  Can you give us more PV?

Cheers,
Heiner



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