Author: Eugene Nalimov
Date: 19:58:02 09/17/99
Go up one level in this thread
If everything will go right, on Monday I'll have KQQKQQ ready. Eugene On September 17, 1999 at 22:51:22, Richard Bean wrote: >it looks like kasparov has blundered with 45.Ke4, >allowing the following continuation: > >1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. c4 Nc6 6. Nc3 Nf6 7. O-O g6 >8. d4 cxd4 9. Nxd4 Bg7 10. Nde2 Qe6 11. Nd5 Qxe4 12. Nc7+ Kd7 13. Nxa8 Qxc4 >14. Nb6+ axb6 15. Nc3 Ra8 16. a4 Ne4 17. Nxe4 Qxe4 18. Qb3 f5 19. Bg5 Qb4 >20. Qf7 Be5 21. h3 Rxa4 22. Rxa4 Qxa4 23. Qxh7 Bxb2 24. Qxg6 Qe4 25. Qf7 >Bd4 26. Qb3 f4 27. Qf7 Be5 28. h4 b5 29. h5 Qc4 30. Qf5+ Qe6 31. Qxe6+ Kxe6 >32. g3 fxg3 33. fxg3 b4 34. Bf4 Bd4+ 35. Kh1 b3 36. g4 Kd5 37. g5 e6 38. h6 >Ne7 39. Rd1 e5 40. Be3 Kc4 41. Bxd4 exd4 42. Kg2 b2 43. Kf3 Kc3 44. h7 Ng6 >45. Ke4 Kc2 46. Rh1 d3 47. Kf5 Nh8 48. g6 d2 49. g7 d1=Q 50. Rxd1 Kxd1 >51. gxh8=Q b1=Q+ > >now the problem is, the PV in crafty always has a 5-man draw >in it, yet the evaluation is about +3 for White. > >even with the Peter Karrer modifications to evaluate.c: >---begin mods--- > if (drawn_ending > 0) return(DrawScore(root_wtm==wtm)); > score=Material; > if (Material == -100) score = 0; /* new */ > if (Material == 0) score = -200; /* new */ > >The first line ensures that white will evaluate its position as >positive, preventing it from trading down to (EGTB) draws. > >Second line gives a penalty of two pawn equivalents for capturing a >black pawn. This avoids silly things such as 51.Qc8 followed by >52.Qxb7 in ending D. >---end mods--- > >Now crafty *still* has White capturing both pawns at 23 ply, leading to an egtb >draw - eval still > +2. > >Are there any modifications possible to make *any* program >evaluate this as a draw, which it certainly seems to be? there is just check >after check in the PV... > >(of course, many thanks to Robert Hyatt & Eugene Nalimov for >writing the programs in the first place!)
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