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Subject: Re: Spike-Rybka

Author: Vasik Rajlich

Date: 03:03:35 12/29/05

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On December 28, 2005 at 18:11:49, Drexel,Michael wrote:

>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
>

Ok, true, it looks like black missed this chance to equalize here. White just
needs to prevent .. axb5 cxb5 d5. For example, just one move later, I again
think white is clearly better:

[D] 8/1b2b3/pp1pppk1/nP4q1/P1P1P1P1/2QRNP2/3N4/4KB1r b - - 0 29

Now there is no more 29. .. axb5 30. cxb5 d5 31. exd5 Bc5.

Vas

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



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