Author: blass uri
Date: 14:01:49 01/22/99
Go up one level in this thread
On January 22, 1999 at 10:44:45, Christopher R. Dorr wrote:
>Hello!
>
>I was watching a veryy interesting game between Ban and Crafty on ICC the other
>day. The moves are:
>
>[Event "ICC 15 3"]
>[Site "Internet Chess Club"]
>[Date "1999.01.20"]
>[Round "-"]
>[White "*ban"]
>[Black "*crafty"]
>[Result "1-0"]
>[WhiteElo "2624"]
>[BlackElo "2594"]
>[Opening "QGD"]
>[ECO "D52"]
>[NIC "QP.08"]
>[Time "18:16:21"]
>[TimeControl "900+3"]
>
>1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 Nbd7 5. Bg5 c6 6. e3 Bb4 7. cxd5 cxd5 8. Qc2
>O-O 9. Bd3 h6 10. Bh4 Qc7 11. Rc1 Bd6 12. Bg3 e5 13. dxe5 Nxe5 14. Nxe5 Bxe5 15.
>Nxd5 Qa5+ 16. Nc3 Bxc3+ 17. Qxc3 Qxa2 18. Bc4 Qa4 19. Be5 Nh5 20. Be2 Nf6 21.
>Bxf6 gxf6 22. Qxf6 Qb4+ 23. Kf1 Be6 24. Rd1 Rfc8 25. Qxh6 Qxb2 26. Qg5+ Kf8 27.
>Qh4 Rc1 28. g3 Rc2 29. Qh5 Rac8 30. Qh6+ Ke8 31. Rd4 Rxe2 32. Qh8+ Ke7 33. Qh4+
>f6 34. Qh7+ Bf7 35. Re4+ Kd6 36. Rd4+ Qxd4 37. exd4 Bc4 38. Qh6 Kd7 39. h4 Rce8
>40. Rh2 Bd5 41. Qg7+ R2e7 42. Qg4+ Kc6 43. Qd1 Re1+ 44. Qxe1 Bc4+ 45. Kg2 Rxe1
>46. h5 Bd5+ 47. Kh3 Rh1 48. Rxh1 Bxh1 49. g4 a5 50. f4 Be4 51. f5 a4 52. h6 Bxf5
>53. gxf5 a3 54. h7 a2 55. h8=Q a1=Q 56. Qxf6+ Kb5 57. Qd6 Qf1+ 58. Kg4 Qg2+ 59.
>Kh5 Qf3+ 60. Kg6 Qg4+ 61. Kf6 Kc4 62. Qc5+ Kd3 63. Qb5+ Kc3 64. Qxb7 Qh4+ 65.
>Ke6 Qg4 66. Qc6+ Kd2 67. d5 Qg8+ 68. Kf6 Qh8+ 69. Kg5 Qg7+ 70. Qg6 Qe7+ 71. Qf6
>Qe3+ 72. Kg6 Qe8+ 73. Kg7 Qd7+ 74. Qf7 Qd6 75. f6 Kc3 76. Qe6 Qg3+ 77. Kf7 Qc7+
>78. Qe7 Qc4 79. Qd6 Kb3 80. Qb6+ Ka2 81. Qc6 Qb3 82. Qa6+ Kb1 83. Qf1+ Kb2 84.
>Qe2+ Kb1 85. Ke6 Qb8 86. Qe4+ Kc1 87. Qc4+ Kb2 88. f7 Qf8 89. Qd4+ Kc1 90. d6
>Qh6+ {Black resigns} 1-0
>
>This game left me somewhat puzzled. I'm going to analyze it on my MII/266 at
>home, but here at work I only have a P75 to look at it, and that doesn't help
>much.
>
>I had three primary questions about this:
>
>1. Crafty's play between moves 12-24 seems distinctly 'UnCrafty-like'. I've
>played/watch probably 1000 Crafty games, and this series of moves seems very
>peculiar. Crafty seemed to allow a total destruction of it's kingside, by moves
>only a few ply deep. What was going on? Bob - do you keep the log files on ICC
>games, or do they disappear?
>
>2. I'm not 100% sure, but the Crafty's queen sac with 36...Qxd4 seems remarkable
>and sound. Any idea how deep it was searching, and what it's evaluation was?
>
>3. How could a computer that could come up with the above-mentioned profound
>sacrifice play 49...a5? This seems to lose almost by force.
49...a5 is a winning move.
The mistake of crafty was 50...Be4(50...Bd5 is winning)
It is not easy for computers to find 50...Bd5(crafty15.18 as an engine for
fritz5 needs more than 8 minutes to find Bd5 on pentium200MMX)
finding 36...Qxd4 is more easy for computers.
And at fairly
>shallow depths, especially for an ending.
programs do not think that the line 50...Be4 51.f5 Bd5 52.h6 Bg8 53.g5 fxg5
54.f6 Be6+ 55.Kg3 Bg8 56.f7 Bxf7 57.h7 with 58.h8Q is low depth.
Uri
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