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Subject: Re: Is the queen sac sound?

Author: Dann Corbit

Date: 18:57:49 12/29/03

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On December 29, 2003 at 20:44:06, Sune Fischer wrote:

>
>[D]8/6pk/4Q2p/3P1P1q/8/6P1/4rP2/2R3K1 w - - 0 56
>
>In the actual game Frenzee played d6!? and went on to win.
>
>In post mortem analysis it switches to Re1 with a bit more time, still
>sacrificing the queen.
>
>I've been playing a little bit with the eval scores for passed pawns
>and not surprisingly the position is very sensitive to these changes.
>
>Any other engines who wants to sacrifice the queen here, is it sound
>or a lucky punch?
>
>-S.

From the base position you listed, crafty likes Qa6 best...

[D]8/6pk/4Q2p/3P1P1q/8/6P1/4rP2/2R3K1 w - - acd 15; acn 35231424; acs 60; ce
182; pv Qa6 Rd2 Qe6 Re2 Qd7 Qf3 Rf1;

But after forcing the queen sac, the new position looks better...

[D]8/6pk/3PQ2p/5P1q/8/6P1/4rP2/2R3K1 b - - acd 16; acn 36333252; acs 62; ce
-236; pv Rxe6 fxe6 Qg5 Rf1 Kg6 e7 Kf7 Rb1 Qg4 Rb8 Qd1+ Kh2 Qh5+ Kg2 Qd5+ f3 Qa2+
Kh3 Qe6+ g4 Qe1 e8=Q+ Qxe8 Rxe8 Kxe8;

I also tried this (which looked natural to me --> I would simplify and try to
push the passer.  Naturally, it's not so good.):
[D]8/6pk/6Qp/3P1P1q/8/6P1/4rP2/2R3K1 b - - acd 16; acn 30538534; acs 60; ce
-165; pv Qxg6 fxg6+ Kxg6 Rd1 Kf7 d6 Ke8 Kf1 Ra2 d7+ Kd8 f4 Ra7 Kf2 Rxd7 Rxd7+
Kxd7 f5 Kd6;

And this:
[D]8/6pk/1Q5p/3P1P1q/8/6P1/4rP2/2R3K1 b - - acd 14; acn 35648716; acs 60; ce
-182; pv Qxf5 Qd4 Re4 Qd2 Re5 Rd1 Kg6 d6 Qd7 Qd3+ Kf6 f4 Re8 Kg2;



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