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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