Author: Uri Blass
Date: 14:34:56 06/09/01
Go up one level in this thread
On June 09, 2001 at 16:18:45, Rafael Andrist wrote: >On June 09, 2001 at 10:55:23, Uri Blass wrote: > >>On June 09, 2001 at 09:00:28, Rafael Andrist wrote: >> >>>In a game (20 sec/move) between "Der Bringer" and my program occured this >>>endgame position. My program - playing as Black - sees only a small advantage >>>for White, but it looses. Is it possible to draw the endgame or was the game >>>already lost before? >>> >>>[D]6k1/pB2pp1p/6p1/8/4P3/5K2/r5PP/3R4 b - - 1 30 >>> >>>the game continued: >>>30. ... Kg7 31. e5 Ra5 32. Ke4 e6 33. Rd7 Ra4+ 34. Ke3 Ra3+ 35. Kf4 h6 36. Bc6 >>>g5+ 37. Ke4 Rc3 38. Ba8 a5 39. Ra7 Ra3 40. Bc6 Ra2 41. Be8 Re2+ 42. Kd4 Rd2+ 43. >>>Ke3 Rxg2 44. Bxf7 Rxh2 45. Bxe6+ Kg6 46. Rxa5 Rh1 47. Ke2 Kh5 48. Bf5 Rh2+ 49. >>>Ke3 Rh1 50. e6 Kh4 51. e7 Re1+ 52. Kf3 Rxe7 53. Ra4+ Kh5 54. Ra1 g4+ 55. Kf4 Re3 >>>56. Rh1+ Rh3 57. Bxg4+ Kg6 58. Rxh3 Kg7 59. Bf5 Kf6 60. Rxh6+ Kg7 61. Kg5 Kf7 >>>62. Re6 Kf8 63. Kg6 Kg8 64. Re8# 1-0 >>> >>>Maybe it is easier for humans than for computers to judge this position >>>correctly, but I am a too weak player to do that. >>> >>>Rafael B. Andrist >> >>It is easy for computers to see a clear advantage for white. >> >>I tried some program and they see at least 1.xx for white. >> > >I tried other programs too, but an advantage around 1 is not an easy win. So >there exists a good chance to draw the position. Also, none of them showed a >clear "plan" how to win this. > >>I believe that your program overevaluate pawns so you may try to reduce the >>value of pawns. > >Yes, I know that I give a little bit to big bonuses for passers etc. The pawn >value itself is not the problem. I don't think that a bishop is really more >worth than 3 pawns. I believe that a bishop in most of the cases worth more than 3 pawns(3 pawns may draw often against a bishop but they also may lose often against a bishop and cases when they can win are rare if there are no advanced passed pawns but in this case your program may see other positional bonuses). I know that one of the changes in Junior6 relative to Junior5 was to reduce the value of the pawn. I guess that giving pawns and passed pawns 80% of the value that you give them can help your program to get better results in games. Uri
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