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Subject: Re: Spike-Rybka

Author: Drexel,Michael

Date: 15:11:49 12/28/05

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On December 28, 2005 at 12:48:11, Vasik Rajlich wrote:

>On December 28, 2005 at 09:20:44, Jan Kiwitter wrote:
>
>>On December 28, 2005 at 07:33:18, Drexel,Michael wrote:
>>
>>>On December 28, 2005 at 03:12:23, Vasik Rajlich wrote:
>>>
>>>>Interesting game. I didn't like .. h6 and .. g5 by Rybka in the opening (as I
>>>>suspect most human players won't), and there were a few moments in the endgame
>>>>where better resistance could have been put up - but these are relatively minor
>>>>points.
>>>>
>>>>The biggest issue was the incorrect sacrifice of the h6 pawn. The Rybka static
>>>>eval incorrectly gives the following position (and others of a similar type) as
>>>>roughly equal:
>>>>
>>>>[D] 8/1b2b1k1/pp1ppp2/nPq5/P1P1P3/2QRNPP1/8/1N2KB1r b - - 0 27
>>>
>>>The position _is_ roughly equal.
>>>It was just badly misplayed by Rybka.
>>
>>I also thought like this during the game. I think instead of exchanging the
>>queens soon Rybka may have tried to activate his pair of bishops by planning
>>f6-f5 sooner or later. (Of course this was just my impression without any deep
>>analysis.)
>>
>>Greetings
>>Jan
>
>Mike / Jan,
>
>can you win or even draw against an engine like Shredder here?

Did I wrote Black is better?
Roughly equal means black can get a draw from this position.

I would suggest to play 27...Qg5 28.g4 (28.Kf2 Qh5 29.Rd1 d5! is of course not
better) axb5 29.cxb5 (Spike Mainz prefers 29.axb5 but Black is obviously fine
after 29...Bc8! with the idea Na5-b7-c5, the key maneuver in this position) d5!
30.Qc7 (30.exd5 Bc5 31.dxe6 Bxe3 32.Rxe3 Qh4+ leads to a draw by repetition)
Kf8 31.exd5 (31.Nd2 d4! 32.Nec4 (32.Nc2 e5; 32.Ng2 Qc5) Nxc4 33.Qxc4 e5 leads to
another draw by repetition) Bxd5 32.Nd2 Qh4+ (Bb4!?) 33.Ke2 (33.Kd1 Qf2 34.Kc2
Bc3+ =) Rh2+ 34.Kd1 (34.Bg2 Qh3) Qf2 35.Nxd5 (35.Qc8+ Kf7) exd5 36.Qc8+ Kf7
37.Rxd5 Qg1! 38.Rh5 Rxd2+ =

Michael




 Computer assisted
>is ok. This looks like a classic case of a position which canīt be improved ..

>Vas



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