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Subject: Re: Position where all programs fail

Author: fca

Date: 04:18:09 08/22/98

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On August 21, 1998 at 11:40:00, Moritz Berger wrote:

>After some analysis I arrived at the conclusion that white is lost after
>11.Qxg7?? (the novelty in this game). Black has a forced win with accurate play,
>no matter how white tries to defend afterwards.

Yup.

>I have found no program so far that didn't play 11.Qxg7 even at overnight
>analysis.

Yup.  To save time, I stepped along as well, to see when the programs finally
"got it" - ages.

>Is there any program that resists to the temptation of Qxg7???

I would suggest only a program where the king safety consideration caused open
files (typically g-file, also h/b/c/a maybe) to their castled king to be a
sufficient no-no to prevent it.  Unlikely IMO; there appears (to a comp) to be
no other attractive move either, and the bishops raking the castled king
position were there anyway (of course it is the combination of attacks on the
castled position that doom white).

Any programmer could easily adjust his program not to play Qxg7, as Moritz
obviously knows, by adjustments along the lines just specified.  Doing it
without producing catastrophic weakening elsewhere is the hard
(understatement...) bit.

Kind regards

fca

>Moritz
>
>Zugzwang - Pavasovic,D (2475) [C43]
>Hans & Lenze It Lippstadt GER (8), 06.08.1998>
>1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 d5 5.Nxe5 Nd7 6.Qe2 Nxe5 7.Bxe4 dxe4 8.Qxe4
>Be6 9.Qxe5 Qd7 10.0-0 Bd6 11.Qxg7 0-0-0 12.Qh6 Rdg8 13.g3 Rg6 14.Qh5 Bg4 15.Qd5
>h5 16.Nc3 Kb8 17.Ne4 Bf3 18.Nc5 Qg4 19.Qxf7 h4 20.Nd7+ Ka8 21.Re1 Rgg8 22.Qe6
>hxg3 23.fxg3 Qh5 0-1

Zugzwang is in good and considerable company in playing Qxg7 :-)

Kind regards

fca



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