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Subject: Re: What is the correct evaluation of this position?

Author: Jeremiah Penery

Date: 21:55:07 04/05/00

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On April 05, 2000 at 21:26:50, Mark Ryan wrote:

>On April 05, 2000 at 16:03:55, Dann Corbit wrote:
>
>>On April 05, 2000 at 12:59:30, Mark Ryan wrote:
>>
>>>Leko (2670) - Beliavsky (2690), Madrid 1998
>>>
>>>[D]3q1kr1/3n1p2/2p3p1/p2pPB2/3P4/2P1K1Q1/Pr3P2/6RR b - -
>>>
>>>Leko:  "Thanks to my good structure and the light-squared bishop my king is safe
>>>in the centre, whereas the black king has nowhere to go."  Beliavsky played
>>>29...Nb6, after which Leko says White has "the upper hand".  However, after 5
>>>minutes of analysis each, before and after 29...Nb6, the position is evaluated
>>>as equal by my aging programs, Fritz 5.32, Comet B02, Doctor 3.0, and Crafty
>>>16.6 (I really should upgrade these old war horses); Hiarcs 7.32 gives White a
>>>slight advantage.  [Leko won the game six moves later.]
>>
>>CAP record:
>>3q1kr1/3n1p2/2p3p1/p2pPB2/3P4/2P1K1Q1/Pr3P2/6RR b - - acd 12; acn 129329667; acs
>>1000; ce -25; pv Nb6 Bd3 Rxa2 Rh7 Qe7 Rb1 Nd7 Rb7 c5 Bb5 cxd4+ cxd4 Qa3+ Bd3;
>>
>>Here is the game in question:
>>
>>[Event "7th Torneo Magistral"]
>>[Site "Madrid"]
>>[Date "1998-??-??"]
>>[Round "6"]
>>[White "P. Leko"]
>>[Black "A. Beliavsky"]
>>[Result "1-0"]
>>[ECO "B08"]
>>[Opening "Pirc"]
>>[Variation "classical (two knights) system"]
>>
>>1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be3 c6 6. Qd2 b5 7. Bd3 Bg4 8.
>>e5 b4 9. Ne4 Nxe4 10. Bxe4 d5 11. Bd3 Bxf3 12. gxf3 a5 13. h4 Nd7 14. h5
>>Qb6 15. c4 bxc3 16. bxc3 e6 17. Rb1 Qc7 18. Bh6 Bf8 19. Bg5 Rg8 20. hxg6
>>hxg6 21. Ke2 Be7 22. Bxe7 Kxe7 23. Qg5+ Ke8 24. f4 Qd8 25. Qg3 Kf8 26. Rbg1
>>Rb8 27. f5 Rb2+ 28. Ke3 exf5 29. Bxf5 Nb6 30. Bd3 Nc4+ 31. Bxc4 dxc4 32.
>>Qf4 Qe7 33. Rb1 Qa3 34. Kf3 g5 35. Qc1 1-0
>>
>>
>>I think 33. Rb1 is the master stroke.  From there forward it is curtains.
>
>Hi: Sorry to ask, Dann, but in a nutshell ...
>    1.  What is the Chess Analysis Project?;

I'll have to let Dann answer this better.  It's sort of a concerted effort to
build the "ultimate computer chess opening book" or something.

>    2.  How do I read "acd 12; acn 129329667; acs 1000; ce -25"?

acd = Actual Count of Depth (or something close).  Depth to which the position
was searched.

acn = Actual Count of Nodes.  The number of nodes the program searched.

acs = Actual Count of Seconds.  Number of seconds the search lasted.

ce = Centipawn Evaluation.  In other words, the score given by the program.



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