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Subject: Re: wall busting mate...

Author: Heiner Marxen

Date: 06:36:33 04/17/01

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On April 13, 2001 at 17:08:01, Paul wrote:

>On April 13, 2001 at 16:48:28, ujecrh wrote:
>
>>On April 13, 2001 at 15:25:44, Dann Corbit wrote:
>>
>>>[D]4k3/b7/1p1p4/pPpPp1p1/P1P1PpPp/5P1P/2QQ4/K7 w - - bm Qxf4; c0 "M12";
>>
>>Genius 5: Qcc3 Mate in 11
>>Unfortunately I cannot see the full line with genius, here is the beginning:
>>Qcc3 Bb8 Qxa5 bxa5 b6 Kd7 Qxa5 Kd8 Qa8 Kc8 Kb1...
>>
>>Ujecrh
>
>Pretz's first impressions are:
>
>01:25 WM13 23 Qcc3 Bb8 Qxa5 bxa5 Qxa5 Kd7 b6 Kd8 Qa8 Kc8 Kb2 Kd7 Qxb8 Ke7 b7 Kf6
>Ka1 Ke7 Qc7+ Kf6 Qxd6+ Kf7 b8=Q
>02:06 WM11 24 Qcc3 Bb8 Qxa5 bxa5 Qxa5 Kd7 b6 Kd8 Qa8 Kc8 Kb2 Kd7 Qxb8 Ke7 b7 Kf6
>Qh8+ Kf7 b8=Q Ke7 Qc7#
>03:02 WM10 24 Qxf4 gxf4 Qg2 Bb8 g5 Bc7 g6 Kf8 g7+ Kg8 Qg5 Bd8 Qh6 Bf6 Qh8+ Kf7
>g8=Q+ Ke7 Qe6#
>
>Groetjes,
>Paul

Actually, according to Chest it is a mate in 10, with the above key move
Qxf4, as found by Pretz.  The PV of Chest is (K7/600 350MB hash, 152 secs):

Qxf4 exf4 Qb2   Bb8 Qh8+ Kd7 e5     dxe5 Qxb8   Ke7  d6+    Kf6  Qh8+   Ke6  Qf8
   Kd7  Qe7+   Kc8 Qc7#

.... gxf4 g5    Bb8 g6   Bc7 g7     Kf7  Qg2    Kg8  Qg5    Bb8  Qh6    Kf7  Qh7
   Kf6  g8=N+  Kg5 Qf5#

This time Chest was comparatively fast :-)

Heiner



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