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Subject: Re: Spike-Rybka

Author: Drexel,Michael

Date: 11:57:35 12/29/05

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On December 29, 2005 at 06:03:35, Vasik Rajlich wrote:

>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
>>>>>>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
>>>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+ =
>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.

I agree, the position after 28...Kg6? is already difficult for black.
The line above is maybe too deep but there are certainly other ways for Black to
put up a little more resistance.


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

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