Author: Robert Hyatt
Date: 19:56:04 04/09/00
Go up one level in this thread
On April 09, 2000 at 20:08:41, Laurence Chen wrote:
>Thanks for your output. Your data demonstrates that Fritz 6 has some kind of bug
>when accessing the tablebases. But it managed to win. Perhaps, Robert Hyatt can
>explain or someone, I always thought when a chess engine accesses tablebases and
>finds a distant mate in XX moves, it will play the best move to mate. Fritz 6a
>shows a very odd behavior, as seen the score of the game provided below, it
>plays moves which extends the mate, noticed that from move 100 to 105, the mate
>announcement keep jumping up and down between mate in 16 and 17. I take this to
>be a bug in the Fritz 6a. I don't see this kind of behavior in my other chess
>engines. So what's your opinion?
>Laurence
first suggestion, since you downloaded files, check the sizes between what
you have and what is on my machine. They must match _exactly_. Not one byte
bigger or smaller, otherwise that file is unusable.
even a one byte change will change mates into draws and so forth.
>
>On April 09, 2000 at 18:35:56, Mark Young wrote:
>
>>On April 09, 2000 at 14:25:53, Robert Hyatt wrote:
>>
>>>On April 09, 2000 at 12:18:49, Mark Young wrote:
>>>
>>>>On April 09, 2000 at 11:55:03, Laurence Chen wrote:
>>>>
>>>>>Without the 5 men tablebases, only using the 3 and 4 men tablebases, Fritz 6a
>>>>>plays the endgame correctly. Thus, it seems that Fritz 6a uses the 5 men
>>>>>tablebases incorrectly. Bummer !!!
>>>>
>>>>I have the 5 men tablebases, and it worked on my system.
>>>
>>>
>>>do you have _all_ or _some_? There are 7.5 gigs of compressed 5 piece
>>>tables available. The two of you might easily be testing with different
>>>ones available.
>>
>>I had other moves that were different then the one laurence's fritz 6 would
>>play, but I will give the mistake that took away the win for fritz 6a and show
>>what my system would have played. 87... Kh5 {0.00/47 0} Played by Laurences
>>fritz 6 leads to a draw, but my fritz 6 refused to play his and instead played
>>the winning move Rb4+ with a mate in 30.
>>
>>[Event "?"]
>>[Site "?"]
>>[Date "????.??.??"]
>>[Round "?"]
>>[White "New position"]
>>[Black "?"]
>>[Result "0-1"]
>>[SetUp "1"]
>>[FEN "8/8/2R5/1r6/5Kpk/8/8/8 b - - 0 87"]
>>[PlyCount "67"]
>>
>>87... Rb4+ {-#30/1 3} 88. Ke3 {-#30/1 1} 88... Kh3 {-#29/1 0} 89. Rh6+ {
>>-#29/1 0} 89... Kg2 {-#28/1 0} 90. Rh4 {-#28/1 0} 90... Rb3+ {-#27/1 0} 91. Ke2
>>{-#27/1 0} 91... g3 {-#26/1 0} 92. Rh5 {-#26/1 0} 92... Ra3 {-#25/1 0} 93. Rg5
>>{-#24/1 1} 93... Kg1 {-#24/1 0} 94. Rc5 {-#23/1 1} 94... g2 {-#23/1 0} 95. Rh5
>>{-#23/1 0} 95... Ra4 {-#22/1 0} 96. Rh7 {-#21/1 0} 96... Ra5 {-#21/1 1} 97. Rg7
>>{-#20/1 0} 97... Rh5 {-#20/1 0} 98. Kf3 {-#19/1 0} 98... Rh2 {-#19/1 0} 99. Ke4
>>{-#18/1 0} 99... Kh1 {-#18/1 0} 100. Kd5 {-#17/1 0} 100... Rh5+ {-#16/4 1} 101.
>>Ke4 {-#16/1 1} 101... Rh4+ {-#16/4 1} 102. Kf5 {-#16/1 1} 102... Rh5+ {
>>-#16/1 11} 103. Kf6 {-#16/1 4} 103... Rh6+ {-#17/4 5} 104. Kf5 {-#17/1 1}
>>104... g1=Q {-#16/1 1} 105. Rxg1+ {-#17/1 1} 105... Kxg1 {-#16/1 1} 106. Ke5 {
>>-#16/1 1} 106... Rh4 {-#15/1 1} 107. Kd6 {-#14/1 1} 107... Kf2 {-#14/1 0} 108.
>>Kd5 {-#13/1 0} 108... Ke3 {-#13/1 0} 109. Ke6 {-#12/1 0} 109... Re4+ {-#12/1 0}
>>110. Kd6 {-#11/1 0} 110... Kd4 {-#11/1 0} 111. Kc6 {-#11/1 0} 111... Re2 {
>>-#10/1 0} 112. Kd6 {-#9/1 0} 112... Kc4 {-#9/1 0} 113. Kc6 {-#8/1 0} 113... Rd2
>>{-#8/1 0} 114. Kb6 {-#8/1 0} 114... Rd6+ {-#7/1 0} 115. Kb7 {-#6/1 0} 115...
>>Kb5 {-#6/1 0} 116. Kc7 {-#6/1 0} 116... Rd2 {-#5/1 0} 117. Kb7 {-#5/1 0} 117...
>>Rc2 {-#4/1 0} 118. Ka8 {-#3/1 0} 118... Ka6 {-#3/1 0} 119. Kb8 {-#3/1 0} 119...
>>Kb6 {-#2/1 0} 120. Ka8 {-#2/1 0} 120... Rc8# {-#1/1 0} 0-1
>>
>>
>>>
>>>
>>>>
>>>>>Laurence
>>>>>On April 09, 2000 at 11:47:22, Mark Young wrote:
>>>>>
>>>>>>On April 09, 2000 at 09:47:27, Laurence Chen wrote:
>>>>>>
>>>>>>I could not reproduce the draw, Fritz 6a always won.
>>>>>>
>>>>>>>Here's a position which Fritz 6a played against Rebel-Tiger 12e, and somehow
>>>>>>>Fritz 6a blundered away a win to a draw. It played like a drunk in my opinion in
>>>>>>>this endgame. It seems to be a major bug in Fritz 6a when accessing the
>>>>>>>tablebases. I tested this position with other engines, Junior 6a, Hiarcs 7.32,
>>>>>>>Crafty 17.07, and they all played the endgame correctly. I have all the 5 men
>>>>>>>tablebase endgame in my hard-drive. And the engines have access to all the
>>>>>>>tablebases. Can someone check if this happens also in Fritz 6a?
>>>>>>>
>>>>>>>Position after move 70. Black to move.
>>>>>>>[d]8/8/8/2K3p1/3r2P1/4k3/2R5/8 b - - 0 70
>>>>>>>
>>>>>>>[Event "Level=Blitz:5'+3". "]
>>>>>>>[Site "Mississauga"]
>>>>>>>[Date "2000.04.08"]
>>>>>>>[Round "4"]
>>>>>>>[White "Rebel-Tiger 12e"]
>>>>>>>[Black "Fritz 6"]
>>>>>>>[Result "1/2-1/2"]
>>>>>>>[ECO "E19"]
>>>>>>>[Annotator "0.37"]
>>>>>>>[PlyCount "198"]
>>>>>>>[EventDate "2000.04.08"]
>>>>>>>
>>>>>>>{16384kB, General.ctg. Pentium III 600E
>>>>>>>} 1. d4 {0} 1... Nf6 {0} 2. c4 {0}
>>>>>>>2... e6 {0} 3. Nf3 {0} 3... b6 {0} 4. g3 {0} 4... Bb7 {0} 5. Bg2 {0} 5... Be7 {
>>>>>>>0} 6. O-O {0} 6... O-O {0} 7. Nc3 {0} 7... Ne4 {0} 8. Qc2 {0} 8... Nxc3 {0} 9.
>>>>>>>Qxc3 {1} 9... c5 {0} 10. Rd1 {0} 10... d6 {0} 11. b3 {0} 11... Bf6 {0} 12. Bb2
>>>>>>>{0} 12... Qe7 {0} 13. Qc2 {1} 13... Nc6 {0} 14. e4 {0} 14... g6 {0} 15. d5 {0}
>>>>>>>15... Nb4 {0} 16. Bxf6 {0} 16... Qxf6 {0} 17. Qd2 {0} 17... e5 {0} 18. a3 {11}
>>>>>>>18... Na6 {0} 19. Qh6 {last book move 25} 19... Qg7 {0.37/12 13} 20. Qxg7+ {7}
>>>>>>>20... Kxg7 {0.31/13 0} 21. Bh3 {10} 21... Kf6 {0.25/12 34} 22. Bd7 {10} 22...
>>>>>>>Nb8 {0.12/13 31} 23. Ba4 {16} 23... Ke7 {0.12/12 11} 24. Nh4 {11} 24... f5 {
>>>>>>>0.03/13 13} 25. f4 {6} 25... fxe4 {-0.25/12 19} 26. fxe5 {13} 26... dxe5 {
>>>>>>>-0.38/12 19} 27. Re1 {16} 27... Kd6 {-0.38/12 8} 28. Rxe4 {6} 28... a6 {
>>>>>>>-0.31/12 2} 29. Re3 {4} 29... b5 {-0.06/12 4} 30. cxb5 {7} 30... axb5 {
>>>>>>>-0.19/12 9} 31. Bxb5 {11} 31... Bxd5 {-0.19/12 0} 32. Rd1 {6} 32... Nc6 {
>>>>>>>0.06/11 1} 33. Bxc6 {8} 33... Kxc6 {0.37/12 0} 34. b4 {8} 34... e4 {0.50/11 0}
>>>>>>>35. Rc3 {6} 35... c4 {0.00/12 17} 36. Ng2 {16} 36... Bg8 {0.00/13 0} 37. Rd4 {7
>>>>>>>} 37... Rfe8 {0.00/12 7} 38. Ne3 {11} 38... Kb5 {0.00/13 0} 39. Nc2 {8} 39...
>>>>>>>Rad8 {0.09/12 10} 40. Kf2 {19} 40... Ka4 {0.00/15 0} 41. Ke3 {4} 41... Bd5 {
>>>>>>>0.00/13 3} 42. Rd2 {9} 42... Rf8 {0.00/12 10} 43. Ke2 {0} 43... Bg8 {0.00/12 12
>>>>>>>} 44. Nd4 {4} 44... Rde8 {0.00/11 9} 45. Ke1 {5} 45... h6 {0.03/12 27} 46. Re2
>>>>>>>{5} 46... Rf6 {-0.09/12 15} 47. Rce3 {5} 47... Rd8 {-0.38/12 9} 48. Rxe4 {9}
>>>>>>>48... Rfd6 {-0.47/11 1} 49. Ne6 {24} 49... Bxe6 {-1.22/11 3} 50. Rxe6 {17}
>>>>>>>50... Kxa3 {-1.66/13 0} 51. R6e3+ {16} 51... Kxb4 {-1.72/12 6} 52. Rb2+ {1}
>>>>>>>52... Kc5 {-1.78/12 9} 53. Ke2 {5} 53... Rd3 {-1.91/12 7} 54. Rxd3 {13} 54...
>>>>>>>Rxd3 {-1.81/11 3} 55. Ra2 {9} 55... Rd6 {-2.22/12 6} 56. Ke3 {9} 56... c3 {
>>>>>>>-2.53/12 6} 57. Ra7 {4} 57... Kc4 {-2.66/12 2} 58. Rc7+ {3} 58... Kb3 {
>>>>>>>-2.78/12 1} 59. Rb7+ {7} 59... Kc2 {-3.03/14 0} 60. Rc7 {16} 60... Rd3+ {
>>>>>>>-3.25/12 4} 61. Ke2 {1} 61... Rd2+ {-3.28/12 2} 62. Ke3 {4} 62... Rxh2 {
>>>>>>>-3.38/13 0} 63. Rc6 {9} 63... g5 {-3.53/13 0} 64. Kd4 {4} 64... Rd2+ {
>>>>>>>-4.13/12 1} 65. Kc4 {9} 65... Rd3 {-4.16/13 0} 66. g4 {14} 66... Kd2 {
>>>>>>>-5.66/14 0} 67. Rxh6 {9} 67... c2 {-14.44/11 5} 68. Rh2+ {2} 68... Ke3 {
>>>>>>>-15.66/12 0} 69. Rxc2 {3} 69... Rd4+ {-#34/6 0} 70. Kc5 {2} 70... Rxg4 {
>>>>>>>-#33/5 0} 71. Kd5 {3} 71... Rd4+ {-#31/4 0} 72. Ke5 {2} 72... Rb4 {-#30/5 0}
>>>>>>>73. Rc3+ {4} 73... Kf2 {-#29/5 0} 74. Rc2+ {2} 74... Kg3 {-#28/5 0} 75. Rc3+ {3
>>>>>>>} 75... Kh4 {-#27/5 0} 76. Rc6 {2} 76... Rb5+ {-#31/4 0} 77. Ke4 {4} 77... Rb3
>>>>>>>{-#30/5 0} 78. Kf5 {12} 78... Rf3+ {-#30/4 0} 79. Ke4 {2} 79... Rf4+ {-#30/4 0}
>>>>>>>80. Ke5 {7} 80... Ra4 {-#27/5 0} 81. Kf5 {4} 81... Rf4+ {-#28/4 0} 82. Ke5 {2}
>>>>>>>82... Rb4 {-#27/5 0} 83. Kf5 {2} 83... Rb5+ {-#31/4 0} 84. Ke4 {2} 84... g4 {
>>>>>>>-#30/5 0} 85. Kf4 {3} 85... Rb4+ {-#29/4 0} 86. Kf5 {2} 86... Rb5+ {-#30/4 0}
>>>>>>>87. Kf4 {2} 87... Kh5 {0.00/47 0} 88. Rc8 {3} 88... Rb1 {0.00/47 0} 89. Rh8+ {2
>>>>>>>} 89... Kg6 {0.00/47 0} 90. Kxg4 {2} 90... Kf6 {0.00/47 0} 91. Kf3 {3} 91...
>>>>>>>Ke5 {0.00/47 0} 92. Re8+ {2} 92... Kd4 {0.00/47 0} 93. Rd8+ {2} 93... Kc5 {
>>>>>>>0.00/47 0} 94. Ke4 {2} 94... Ra1 {0.00/47 0} 95. Rd7 {2} 95... Kc6 {0.00/47 0}
>>>>>>>96. Rh7 {4} 96... Kd6 {0.00/47 0} 97. Rh6+ {3} 97... Kc5 {0.00/47 0} 98. Rh8 {2
>>>>>>>} 98... Rf1 {0.00/47 0} 99. Rh7 {2} 99... Rd1 {0.00/47 0} 1/2-1/2
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.