Computer Chess Club Archives




Subject: Re: Transferring eval to deep blue game

Author: Vincent Diepeveen

Date: 17:23:08 12/03/99

Go up one level in this thread

On December 03, 1999 at 17:47:14, Dusan Dobes wrote:

>>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?
>Hm, i dont see the idea. Neither does my proggie. It says just +1.41
>for white in the final position of the game (move 45). It prefers
>36. Qb6 and evaluates it as +1.60.
>What you mean by penalty for having opposite bishops? Phalanx's static
>eval just steals lots of points from material advantage in opposite
>bishops endgame. No rook, no queen, no knight can be onboard, just
>pure K+B+pawns versus K+B+pawns.

That's not gonna work indeed. as after qb6 and a few other moves
you have a rook +opposite bishops ending. So there is a big need for
one small change in the code to test whether it then sees it.

That material stealing is ok. Let it steal at least a pawn.
If you get opposite bishops against kasparov with material up it
gotta be draw anyway. He'll figure something out that is a draw then.

>>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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