Computer Chess Club Archives




Subject: Transferring eval to deep blue game

Author: Vincent Diepeveen

Date: 10:20:46 12/03/99

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On December 03, 1999 at 09:13:48, Dusan Dobes wrote:

>On December 03, 1999 at 08:49:19, Andrew Williams wrote:
>>Over the last few days, I have been fascinated by the discussions on CCC
>>about positional sacrifices. Some of the discussion has centred on the value
>>assigned to the attack that is obtained after the sacrifice and I was wondering
>>how other programs evaluated the position after Hossa's sac:
>>r3q1k1/ppp1rp2/2n1b2Q/8/2P5/3B4/PPP2RPP/5RK1 b - - 0 2
>>This is after 1. Bxh6 gxh6 2. Qxh6 from the original position posted by
>>Peter McKenzie. PostModernist's static evaluation of the position is presented
>>below. Essentially, it thinks that White is winning by 0.71. The ATTACKTOTAL
>>score is generated by analyzing the squares around the King to see how many of
>>them are attacked and what sorts of pieces are attacking them. Please note that
>>not all the factors that contribute to PM's score are included in the output
>>Could other programmers post similar information? I believe that even an
>>overall static evaluation would be interesting.
>>Andrew Williams
>Phalanx XXI static evaluation scores this position as +3.05 for white.
>Material gives -1.5, black king safety +5.76.
>Dusan Dobes

Dusan, if you add a huge penalty for having opposite bishops in endgame,
does PHalanx play 36.axb5! in the deep blue - kasparov game then (game 2),
at say 11 ply depth, or does it need a bit bigger depth?

I assume if so that it plays 37.Be4? too (Qb6 wins forced there).

[Event "ICC u 120 0 05/04/97"]
[Site "Internet Chess Club"]
[Date "1997.05.04"]
[Round "-"]
[White "Deep-Blue"]
[Black "Kasparov"]
[Result "1-0"]
[WhiteElo "0"]
[BlackElo "2795"]
[GameID "862766392"]
[ECO "C93"]
[NIC "RL.22"]
[LongECO "Ruy Lopez: closed, Smyslov defense"]

 1. e4 e5       2. Nf3 Nc6     3. Bb5 a6      4. Ba4 Nf6     5. O-O Be7
 6. Re1 b5      7. Bb3 d6      8. c3 O-O      9. h3 h6      10. d4 Re8
11. Nbd2 Bf8   12. Nf1 Bd7    13. Ng3 Na5    14. Bc2 c5     15. b3 Nc6
16. d5 Ne7     17. Be3 Ng6    18. Qd2 Nh7    19. a4 Nh4     20. Nxh4 Qxh4
21. Qe2 Qd8    22. b4 Qc7     23. Rec1 c4    24. Ra3 Rec8   25. Rca1 Qd8
26. f4 Nf6     27. fxe5 dxe5  28. Qf1 Ne8    29. Qf2 Nd6    30. Bb6 Qe8
31. R3a2 Be7   32. Bc5 Bf8    33. Nf5 Bxf5   34. exf5 f6    35. Bxd6 Bxd6
36. axb5 axb5  37. Be4 Rxa2   38. Qxa2 Qd7   39. Qa7 Rc7    40. Qb6 Rb7
41. Ra8+ Kf7   42. Qa6 Qc7    43. Qc6 Qb6+   44. Kf1 Rb8    45. Ra6
{Black resigns} 1-0

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