Author: Robert Hyatt
Date: 18:03:19 01/03/98
Go up one level in this thread
On January 03, 1998 at 07:34:38, Jeroen Noomen wrote: >On January 03, 1998 at 04:20:02, Jeroen Noomen wrote: > >>Yesterday the first matchgame between Karpov and Anand took place. >>A very interesting position occurred after the 25th move: >> >>Karpov-Anand (1) Slav Defence >>------------------------------ >>1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 >>b5 8. Bd3 Bb7 9. 0-0 a6 10. e4 c5 11. d5 Qc7 12. Bc2 c4 13. dxe6 fxe6 >>14. Nd4 Nc5 15. Qe2 Bd6 16. f4 e5 17. Ndxb5! (This appears to be much >>stronger than Nf5) axb5 18. Nxb5 Qb6 19. Nxd6+ Qxd6 20. fxe5 Qxe5 21. >>Rf5 Qe7 22. Qxc4 (Karpov was still playing very quickly, so I suppose >>this was all in his home preparation) >> >>22. ... Rc8 First interesting moment. I analysed the game in progress >> with Rebel 9 and it hesitated between Nfd7 and Ncd7. >> Rc8 never came up. Is there a program that plays Rc8? > >Rebel 9's actual choice was Ncd7. Not Nfd7?, this loses because of Bg5. >My mistake, actually the choice between Ncd7 and Nfd7 came at the next >move. I did some testing with The King 2.54 on a Pentium 200 MMX: > >It likes 22 ... Ncxe4 (depth = 10), although this seems very risky to >me. >Variation: 22 ...Ncxe4 23 Bf4,Rc8 24 Qb5+,Kf8 +0.42 for Black. >After 22 ... Ncd7!? The King gives 23 Bd2!? with the idea of Bb4. Still, >the score is only -0.17 for White (depth = 10). > >>23. Qb5 Ncd7 > >Here 23 ... Nfd7 is an alternative. According to The King there follows >24 Bg5,Qe6 25 Rd1!, score +0.37 in favour of White. > >>24. Qxb7 Rxc2 >>25. Bg5 Qd6!! This is what it is all about! Rebel plays Qxe4 or >> alternatively Rf8, but that seems to fail to save the >> game. F.e. 25 ... Qxe4 26 Qxe4 Nxe4 27 Re1 and the >> resulting pin is awsome for Black. > I ran this with Crafty, using (again) my P5 notebook. At depth=11, about 2 mins on the P5 (probably about 1 minute with reasonable hash and a P6) Qxe4 fails low, dropping from about +.6 to -.7... this would trigger a "deep think" mode in Crafty, so that so long as it had a target time of at least a minute or so, it would find that this fails and it would not play it... It then settles on Rf8, although when I told it to search Qd6 the scores were very close between the two moves (Rf8 and Qd6)...
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