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Subject: Re: Spike-Rybka

Author: Vasik Rajlich

Date: 09:54:48 12/28/05

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On December 28, 2005 at 03:52:47, Sandro Necchi 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
>>
>>I'll keep to myself my proposed solution. It's a tricky issue and won't be
>>handled until after the Rybka 1.2 release. If anybody wants to share here, I am
>>all ears :-)
>>
>>Vas
>
>Hi Vas,
>
>here a quick game analyse with comments.
>
>Ciao
>Sandro
>
>1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5?! {it is not as
>good as most people think} 5. dxc5! O-O 6. a3 Bxc5 7. Nf3
>Nc6?! {I believe this move to be weak} 8. Bg5 b6?! {the
>problem of this variation is the pawn left in d7 which will make
>it hard to play for most programs} 9. Rd1!? Bb7 10. e4
>h6? {better Be7} 11. Bh4 g5?! {weakening the king }
>12. Bg3 Nh5?! {black should counter attack in the center
>and not look for exchanging the knight versus the bishop}
>13. b4! {Shredder gives here a good advantage to white as
>black will get more compressed} Be7 14. b5?! {it should be
>stronger Qd2 to prepare to attack the king side} Na5
>15. Ne5 d6 16. Ng4 Qc7?! {Rc8 should be stronger}
>17. Nxh6+ Kg7 18. Ng4 Nxg3 19. hxg3 Rh8 20. Rxh8 Rxh8
>21. Nb1 Qc5 22. Qc3+ f6 23. f3 Rh1 24. Ne3! a6 25. a4 g4
>26. Rd3! gxf3 27. gxf3 Qg5 28. g4 Kg6 $2 29. Nd2 Qe5
>30. Qd4 Qxd4? {changing the most active piece gives white
>advantage} 31. Rxd4 Rh8 32. f4! {Shredder gives white
>half a piece ahead while Rybka evaluate the position about
>even...I think Shredder is correct}

Sandro,

I agree with this. Not sure about .. Qxd4, I think itīs already difficult ..

Vas



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