Author: blass uri
Date: 06:56:17 08/05/99
Go up one level in this thread
On August 05, 1999 at 03:50:43, Shep wrote:
>On August 04, 1999 at 12:40:05, blass uri wrote:
>
>>Please post some of these positions when chessmaster sees a win score 10-20
>>moves before its opponent realizes that it is in trouble.
>>
>>I do not think that chessmaster sees 20 plies more than the opponent so the
>>problem must be the evaluation function.
>
>Of course! :)
>
>>There is probably something wrong in the evaluation of other programs and it is
>>important to look at these positions to see what is the problem.
>
>You can check out the positions around move 40 in this game (posted here
>earlier) below. I suppose CM 6000 would also see a similar advantage here. 6666
>showed +1,5 to +2,2 most of the time while Genius wavered between +0.4 and -0.6.
>
>The point in the endgame itself is something different. I think many programs
>tend to "see" long checking sequences that push the actual loss over the search
>horizon. I believe that they go like "Oops, looks like I'm losing... No wait, I
>can give 10 checks in a row, maybe it is perpetual check? Well, I'll rate this
>as -0.05 then".
>Chessmaster seems to be one of the few (the only?) program who does not suffer
>from this problem.
>That's why Genius believed it could keep the king in check constantly while CM
>"knew" the checking would not go on forever (although he could not possible
>"calculate" it that far ahead).
>
>---
>Shep
>
>[Event "Test game, 60 min/game"]
>[Site "?"]
>[Date "1999.07.27"]
>[Round "4"]
>[White "Genius 6.0"]
>[Black "Chessmaster 6666"]
>[Result "0-1"]
>[ECO "B09"]
>[WhiteElo "2645"]
>[BlackElo "2700"]
>
>1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. Be3 Nbd7 7. Qd2 Nb6 8.
>Bd3 c6 9. O-O Ng4 10. f5 Nxe3 11. Qxe3 e5 12. fxg6 hxg6 13. dxe5 dxe5 14. Qc5
>Be6 15. a3 Nd7 16. Qe3 Qe7 17. Rad1 Nb6 18. Nd2 Rad8 19. Be2 Kh7 20. Qf2 Bh6
>21. Nb3 Nc4 22. Bxc4 Bxc4 23. Rfe1 b6 24. Nd2 Be6 25. Nf3 f6 26. Rf1 Bc4 27.
>Ne2 Rfe8 28. Kh1 Kg7 29. b3 Be6 30. Rxd8 Rxd8 31. h3 Kh7 32. Qh4 Rf8 33. b4
>Bc4 34. Re1 a5 35. c3 Ra8 36. Nd2 Bb5 37. Nf1 axb4 38. axb4 Kg7 39. Qg4 Bc4
>40. Nfg3 Bg5 41. Rd1 Be6 42. Qf3 Bb3 43. Rf1 Bc4 44. Rd1 Ra2 45. h4 Bb3 46.
>Rd3 Ra1+ 47. Ng1 Bf4 48. Qg4 Be6 49. Nf5+ Bxf5 50. exf5 e4 51. Rd1 Rxd1 52.
>Qxd1 gxf5 53. Qd4 Bc7 54. Ne2 f4 55. Qd2 Be5 56. Nxf4 Bxf4 57. Qxf4 e3 58.
>Qg4+ Kf8 59. Qe2 Qe5 60. c4 Qd4 61. g4 Qd2 62. Qf3 Kg7 63. Qe4 Kf7 64. Qh7+
>Kf8 65. Qh6+ Ke7 66. Qf4
This is an horrinle losing move.
My latest Junior(Junior5.7) and Fritz5(16 bit) suggest 66.Qh7+ with 0.00
evaluation.
Uri
Qd1+ 67. Kg2 e2 68. Qc7+ Ke6 69. Qxc6+ Ke5
>{Finally, Genius realizes he's going down. Eval drops from -0.6 to -5.
>CM was showing a significant advantage since move 40 already.} 70. Qb5+
>Kf4 71. Qf5+ Ke3 72. Qf2+ Kd3 73. Qf5+ Kd2 74. Qf2 Kc1 75. Qxf6 e1=Q 76. Qa1+
>Kc2 77. Qxd1+ 0-1
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