Author: Omid David Tabibi
Date: 00:45:39 01/07/03
Go up one level in this thread
On January 06, 2003 at 23:31:36, Will Singleton wrote:
>On January 06, 2003 at 18:54:48, Omid David Tabibi wrote:
>
>>Genesis v1.09 can be downloaded at http://www.cs.biu.ac.il/~davoudo
>>
>>Improvements:
>>
>>1.09 (7.1.03)
>>- Implemented futility pruning
>>- Modified quiescence search (about 75% less q-nodes)
>>- Improved null-move pruning
>>- Improved data structures (thanks to Dann Corbit)
>>- Fixed a bug in loading positions under WinBoard
>>
>>Omid.
>
>Genesis has serious problems with this position, looks like a major search bug.
>It played 63.Kf7, with a plus score. Not to mention that it stopped moving
>after that. Perhaps this bug was introduced with the recent modifications?
>
Yes, apparently I have introduced a severe evaluation bug. Before release, I
tested this version only on tactical test suites, and it performed very well...
I will try to fix the problem and release a corrected version by tonight.
>[D]8/6p1/4P1Kp/7P/7b/p7/2k5/2N5 w - - 0 63
>
>Genesis' pv:
>1.g6f7 c2d2 2.e6e7 h4e7 3.f7e7 d2e3 4.e7f7 e3f4 5.f7g6 f4g4 6.c1a2 g4f4 7.g6g7
>f4g5 8.a2b4
>
>[Event "Computer chess game"]
>[Site "MICRON"]
>[Date "2003.01.06"]
>[Round "1"]
>[White "Genesis 1.09"]
>[Black "Amateur 2.4"]
>[Result "0-1"]
>[TimeControl "40/300"]
>
>1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Bc5 6. Nb3 Be7 7. O-O d6 8.
>Nc3 Nf6 9. Be3 Nc6 10. f4 Qc7 11. Na4 b5 12. Nb6 Rb8 13. Nxc8 Qxc8 14. a4
>Nb4 15. axb5 Nxd3 16. Qxd3 Rxb5 17. f5 O-O 18. Bg5 h6 19. Bxf6 Bxf6 20.
>fxe6 Bxb2 21. Rab1 Bf6 22. exf7+ Rxf7 23. Qxd6 Qxc2 24. Nd2 Rxb1 25. Rxb1
>Bg5 26. Qb8+ Rf8 27. Qb3+ Qxb3 28. Nxb3 Rb8 29. Kf2 Rb4 30. g3 a5 31. h4
>Be7 32. Nd2 Rxb1 33. Nxb1 Bb4 34. Ke3 a4 35. Kd4 Be1 36. h5 Bxg3 37. e5 Kf7
>38. Kd5 Ke7 39. Na3 Bf4 40. Nc2 Ke8 41. e6 Ke7 42. Na3 Bc1 43. Nc2 a3 44.
>Nb4 Bf4 45. Na2 Bg3 46. Nc1 Kf6 47. Na2 Ke7 48. Nc1 Bf4 49. Na2 Bd6 50. Nc3
>Bg3 51. Na2 Bd6 52. Nc3 Bc7 53. Na2 Bf4 54. Ke4 Bg5 55. Ke5 Bh4 56. Kf5 Bg3
>57. Nc1 Kd6 58. Na2 Bh4 59. Nc3 Kc5 60. Kg6 Kc4 61. Na2 Kb3 62. Nc1+ Kc2
>63. Kf7 Kxc1
>{Black wins on time} 0-1
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