Author: Robert Hyatt
Date: 14:39:22 01/02/98
Go up one level in this thread
On January 02, 1998 at 16:50:29, Amir Ban wrote:
>
>The first game Comet - Junior in CSCC has a challenging position for
>computers, fit for some test-suite material.
>
>On the 43rd move, black is an exchange up, and can win another piece to
>be a rook up, but this loses.
>
>Black manages to avoid Rxd3 on the 45th move, but plays it on the 47th
>move. Which program manages not to play Rxd3 both times ? Is there a way
>to win here ? It's not even clear to me that black can avoid losing.
>White can play 45. b6 or maybe even h3 and black is in some trouble.
>Also interesting is that white can save the piece by 45. c7 but that may
>be the only way to lose :)
>
>How to evaluate black's 43... e4 ? Maybe one exclamation mark for
>playing it, two exclamation marks for NOT playing it ?
>
>Strangely enough, white got a decisive advantage but then failed to win.
>
>Amir
>
>
>
I ran this and at move 45 crafty never considers Rxd3. But it does
believe that Qc5 gives black a significant advantage (almost +2). First
I'll give it's analysis when it is only allowed to consider Rxd3, then
I'll give complete analysis:
(these are run on my notebook with a .75mb hash, so this can
be searched *far* quicker with bigger hash and a P6200 or
something...)
depth time score variation (1)
7 0.25 -2.87 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3 b6 Rd1+ Kg2
Rd2+ Kh3 Rd8 Kg4
7-> 0.27 -2.87 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3 b6 Rd1+ Kg2
Rd2+ Kh3 Rd8 Kg4
8 1.08 -- Rxd3
8 1.16 -3.03 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Kg7 b7
Rd1+ Kg2 Rd2+ Kh3 Rd8
8-> 1.18 -3.03 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Kg7 b7
Rd1+ Kg2 Rd2+ Kh3 Rd8
9 1.59 -3.16 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Rd1+ Kg2
Rd2+ Kh3 Rd5 b7 Rh5+ Kg4 Rb5
9-> 1.61 -3.16 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Rd1+ Kg2
Rd2+ Kh3 Rd5 b7 Rh5+ Kg4 Rb5
10 4.82 -3.18 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Rd1+ Kg2
Rd2+ Kh3 Rd5 b7 Rh5+ Kg4 Rg5+ Kf4
Rb5
10-> 4.84 -3.18 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Rd1+ Kg2
Rd2+ Kh3 Rd5 b7 Rh5+ Kg4 Rg5+ Kf4
Rb5
11 5.86 -- Rxd3
11 13.71 -4.43 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Kh7 b7
Rb3 c7 Rxb7 c8=Q Rb1+ Kg2 Rb2+ Kh3
Rd2 Qc3
11-> 13.75 -4.43 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Kh7 b7
Rb3 c7 Rxb7 c8=Q Rb1+ Kg2 Rb2+ Kh3
Rd2 Qc3
12 45.43 -4.43 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Kh7 b7
Rb3 c7 Rxb7 c8=Q Rb1+ Kg2 Rb2+ Kh3
Rd2 Qc3 Re2
12-> 45.47 -4.43 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Kh7 b7
Rb3 c7 Rxb7 c8=Q Rb1+ Kg2 Rb2+ Kh3
Rd2 Qc3 Re2
13 2:23 -4.46 Rxd3 Qxd3 Qxd3 Rxd3 Rxd3 b6 Kh7 b7
Rb3 c7 Rxb7 c8=Q Rb1+ Kg2 Rb2+ Kh3
h5 Qf8 f5 Qd6
I then went on to move 47, and found the same thing
as before... .07 seconds into the search Crafty finds that
Rxd3 loses badly and that move never comes back up again.
Is it possible you have a bad bug to play that??
depth time score variation (1)
1 0.00 3.36 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3
1-> 0.01 3.36 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3
2 0.01 3.36 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3
2-> 0.04 3.36 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3
3 0.04 3.36 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3
3-> 0.07 3.36 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3
4 0.07 -- Rxd3
4 0.08 -2.54 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3 b6 Rd2
4 0.10 3.36 Qd4+ Kg2 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3
4-> 0.17 3.36 Qd4+ Kg2 Rxd3 Rxd3 Qxd3 Qxd3 Rxd3
5 0.25 -- Qd4+
5 0.90 0.10 Qd4+ Kh1 Qf6 Be4 Rxd1+ Qxd1 Ra1 Bb1
5 1.23 0.59 Ra2 Qf1 Qh5 h3 Qd5
5 2.08 1.50 Ra5 Qc2 Qd4+ Kg2 Rxb5 Bxb5 Qxd1 Qxd1
Rxd1
5-> 2.11 1.50 Ra5 Qc2 Qd4+ Kg2 Rxb5 Bxb5 Qxd1 Qxd1
Rxd1
6 2.91 -- Ra5
6 3.66 0.16 Ra5 Qf2 Qb3 Qe2 Ra2 Qf3 <HT>
6 4.55 0.65 Ra2 Qf1 Qh5 h3 Qc5+ Kh1 Qe3
6-> 5.30 0.65 Ra2 Qf1 Qh5 h3 Qc5+ Kh1 Qe3
7 5.71 0.63 Ra2 Qf1 Qh5 h3 Qc5+ Kh1 Qe3 c7 Rc8
7-> 8.59 0.63 Ra2 Qf1 Qh5 h3 Qc5+ Kh1 Qe3 c7 Rc8
8 9.16 ++ Ra2!!
8 15.88 1.87 Ra2 Rd2 Ra1+ Kf2 Ra3 c7 Qc5+ Qe3
Qxc7
Kg1 Qc1+ Kg2
8-> 20.62 1.87 Ra2 Rd2 Ra1+ Kf2 Ra3 c7 Qc5+ Qe3
Qxc7
Kg1 Qc1+ Kg2
9 34.41 1.96 Ra2 c7 Rc8 Rd2 Ra1+ Rd1 Rxd1+ Qxd1
Rxc7 Qe2 Qd4+ Kg2 Qb6 Qe5
9-> 41.60 1.96 Ra2 c7 Rc8 Rd2 Ra1+ Rd1 Rxd1+ Qxd1
Rxc7 Qe2 Qd4+ Kg2 Qb6 Qe5
10 1:00 1.96 Ra2 c7 Rc8 Rd2 Ra1+ Rd1 Rxd1+ Qxd1
Rxc7 Qe2 Qd4+ Kg2 Qb6 Qe8+ Kg7 Qe5+
Kh7
10-> 1:24 1.96 Ra2 c7 Rc8 Rd2 Ra1+ Rd1 Rxd1+ Qxd1
Rxc7 Qe2 Qd4+ Kg2 Qb6 Qe8+ Kg7 Qe5+
Kh7
looks like Rxd3 is a simple loss that was -2.87 after
only .26 seconds (the first output Crafty displayed)
8 29.04 1.96 Qc5 Qe2 Rc3 Kg2 Qd6 c7 Rxc7 Qe4
8-> 29.21 1.96 Qc5 Qe2 Rc3 Kg2 Qd6 c7 Rxc7 Qe4
9 41.52 1.74 Qc5 Qe2 Rc3 Kg2 Qd6 Kg1 Kg7 b6 Rxc6
9-> 48.31 1.74 Qc5 Qe2 Rc3 Kg2 Qd6 Kg1 Kg7 b6 Rxc6
10 1:31 1.65 Qc5 Qe2 Rd4 Bc2 Rxd1+ Qxd1 Qxb5 Be4
Qa5 Qc1 Ra1 Bb1
10-> 1:51 1.65 Qc5 Qe2 Rd4 Bc2 Rxd1+ Qxd1 Qxb5 Be4
Qa5 Qc1 Ra1 Bb1
11 3:25 1.80 Qc5 Qe2 Rd4 Bc2 Rxd1+ Qxd1 Qxb5 Be4
Qa5 Kg2 Ra2+ Kh3 Qc7 Bd5
>On December 31, 1997 at 04:46:50, Torsten Schoop wrote:
>
>
>>Hi all,
>>
>>
>>New results:
>>
>>Junior 4.6 - Comet A75 = 1.5 - 0.5
>>Fritz 5 - Rebel 9 = 2.5 - 1.5 (2 tie-break games)
>>
>>
>>Final:
>>
>>Junior 4.6 - Fritz 5
>>
>>
>>
>>New games:
>>
>>[Event "CSCCT 97"]
>>[Site "60/30, P200 MMX"]
>>[Date "1997.12.30"]
>>[Round "3"]
>>[White "Comet A75"]
>>[Black "Junior 4.6"]
>>[Result "1/2-1/2"]
>>[ECO "B87"]
>>[PlyCount "210"]
>>
>>1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6.
>>Bc4 e6 7. Bb3 b5 8. O-O Be7 9. Qf3 Qc7 10. Qg3 O-O 11. Bh6 Ne8 {*} 12.
>>Kh1 {*} Bb7 13.
>>f3 Bf6 14. Be3 Be5 15. Qh3 Nf6 16. Rad1 Nc6 17. f4 Bxd4 18. Bxd4 Nxd4
>>19. Rxd4
>>Rad8 20. Qd3 e5 21. Rb4 a5 22. Rxb5 Ba6 23. a4 exf4 24. Nd5 Nxd5 25.
>>Qxd5 Rde8
>>26. Rxf4 Bxb5 27. axb5 a4 28. Bc4 Rc8 29. Bd3 Qa5 30. c3 a3 31. Qa2 Ra8
>>32. Rf1
>>axb2 33. Qxb2 Rfc8 34. c4 Qd8 35. Qc2 h6 36. e5 dxe5 37. c5 Qd4 38. c6
>>Qd6 39.
>>Bc4 Rf8 40. Qf5 Ra4 41. Bd3 g6 42. Qf3 Ra3 43. Rd1 e4 44. Qxe4 Rd8 45.
>>g3 Qc5
>>46. Qe2 Qd5+ 47. Kg1 Rxd3 48. Rxd3 Qxd3 49. Qxd3 Rxd3 50. b6 Rd1+ 51.
>>Kg2 Kg7
>>52. b7 Rb1 53. c7 Rxb7 54. c8=Q Re7 55. h4 h5 56. Qd8 Rb7 57. Qd5 Rb1
>>58. Qe5+
>>Kh7 59. Kf2 Rd1 60. Qe8 Kg7 61. Qb5 Kh7 62. Kf3 Kg7 63. Ke2 Rh1 64. Qe5+
>>Kg8
>>65. Qe8+ Kg7 66. Qe4 Rh2+ 67. Ke3 Ra2 68. Qe5+ Kh7 69. Qf6 Ra3+ 70. Kf4
>>Ra4+
>>71. Kf3 Kg8 72. Qd6 Rg4 73. Qb8+ Kg7 74. Qb2+ Kg8 75. Qb5 Kg7 76. Qe5+
>>Kh7 77.
>>Qc7 Kg7 78. Qe7 Rc4 79. Qe5+ Kg8 80. Qb8+ Kg7 81. Qb2+ Kg8 82. Qb5 Rg4
>>83. Qc5
>>Ra4 84. Qc8+ Kg7 85. Qc3+ Kg8 86. Qc7 Rg4 87. Qc8+ Kg7 88. Qc3+ Kg8 89.
>>Qe1 Rc4
>>90. Qe3 Rg4 91. Kg2 Rc4 92. Qe8+ Kg7 93. Qe3 Kg8 94. Qe7 Rg4 95. Kh3 Kg7
>>96.
>>Qe5+ Kh7 97. Qf6 Kg8 98. Qa6 Kh7 99. Qb7 Kg7 100. Qb2+ Kh7 101. Qb8 Kg7
>>102.
>>Qe8 Kf6 103. Qe1 Kg7 104. Qd1 Kh6 105. Qa1 Rg5 1/2-1/2
>>
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