Author: Uri Blass
Date: 11:25:41 06/12/01
Go up one level in this thread
On June 12, 2001 at 09:21:44, James T. Walker wrote:
>Here is an interesting game played by Fritz6 and an opponent (Beta) at
>Game/2hours. At move 96 both programs called -#27 (Black mates in 27). Notice
>also that Fritz had called mate in 35 on the previous move. However the game
>ended in a draw. Both programs were running in the Fritz6 GUI with two
>computers and auto232. Another problem is that the last pawn move/capture was at
>move 53 so they were running into the 50 move rule. Maybe this explains the
>draw. Is this a conflict between the engines considering the 50 move rule and
>the GUI using tablebases? Or is the 50 move rule controlled by the GUI also?
>For the next few moves Fritz changed between mate in 29 & mate in 28 and then
>Fritz's score went down to around 1 pawn. Then of course the 50 move rule ended
>the game in a draw at move 103. Should programs continue to play for the mate
>even though the 50 move rule will cause a draw? Did Fritz "give up" on the mate
>because it saw the 50 move rule being enforced? I gave this position to Crafty
>18.3 (Fritz GUI) and it could not find the mate in 27 that both programs saw at
>move 96 even after more than 40 minutes. I'm interested in what other people
>think about this game.
>
>[Event "Blitz:120'/Athlon 900 TB/512M"]
>[Site "?"]
>[Date "2001.06.12"]
>[Round "5"]
>[White "Opponent"]
>[Black "Fritz 6"]
>[Result "1/2-1/2"]
>[ECO "B78"]
>[Annotator "0.47"]
>[PlyCount "206"]
>
>{256MB, General.ctg. Athlon 900 TB/512M
>} 1. e4 {0} 1... c5 {0} 2. Nf3 {1}
>2... d6 {0} 3. d4 {0} 3... cxd4 {0} 4. Nxd4 {0} 4... Nf6 {0} 5. Nc3 {0} 5... g6
>{0} 6. Be3 {0} 6... Bg7 {0} 7. f3 {0} 7... O-O {0} 8. Qd2 {0} 8... Nc6 {0} 9.
>Bc4 {0} 9... Bd7 {0} 10. h4 {0} 10... Rc8 {0} 11. Bb3 {0} 11... h5 {0} 12.
>O-O-O {0} 12... Ne5 {0} 13. Bg5 {0} 13... Rc5 {0} 14. Kb1 {0} 14... b5 {0} 15.
>g4 {0} 15... a5 {0} 16. Bxf6 {0} 16... Bxf6 {0} 17. gxh5 {0} 17... a4 {0} 18.
>Bd5 {0} 18... e6 {0} 19. hxg6 {0} 19... exd5 {0} 20. h5 {0} 20... Bg5 {0} 21.
>f4 {0} 21... Nc4 {0} 22. Qg2 {0} 22... Ne3 {0} 23. Qxg5 {0} 23... Qxg5 {0} 24.
>fxg5 {0} 24... Nxd1 {0} 25. gxf7+ {0} 25... Rxf7 {0} 26. Rxd1 {0} 26... Bg4 {0}
>27. Re1 {0} 27... dxe4 {0} 28. Ndxb5 {0} 28... d5 {last book move 0.47/15 239}
>29. Nd6 {79} 29... Rg7 {737kN/s 0.19/15 178} 30. Rg1 {0} 30... Bxh5 {
>729kN/s 0.37/16 271} 31. Nxa4 {0} 31... Rc6 {702kN/s 0.12/16 242} 32. Nf5 {0}
>32... Rb7 {696kN/s 0.25/15 263} 33. Kc1 {(c3) 0} 33... Bg6 {700kN/s 0.12/14 161
>} 34. Nh4 {0} 34... e3 {714kN/s -0.06/15 176} 35. Nxg6 {0} 35... Rxg6 {
>710kN/s 0.12/15 101} 36. Nc3 {185} 36... d4 {565kN/s -0.03/16 0} 37. Ne2 {398}
>37... Rd6 {690kN/s -0.19/16 0} 38. Rd1 {(Nf4) 132} 38... Rf7 {
>718kN/s -0.50/16 112} 39. b4 {(b3) 145} 39... Rf2 {734kN/s -0.44/16 237} 40.
>Nxd4 {126} 40... Rxd4 {749kN/s -0.06/17 87} 41. Rxd4 {47} 41... Rf1+ {
>691kN/s 0.00/18 59} 42. Kb2 {79} 42... e2 {523kN/s 0.00/18 0} 43. Re4 {242}
>43... e1=R {418kN/s 0.03/20 0} 44. Rxe1 {261} 44... Rxe1 {485kN/s -0.41/22 0}
>45. a4 {221} 45... Kf7 {746kN/s -0.69/21 19} 46. a5 {(Kc3) 140} 46... Ke6 {
>792kN/s -0.97/20 157} 47. c4 {50} 47... Kd6 {799kN/s -1.03/20 54} 48. a6 {
>(Kc3) 256} 48... Re7 {856kN/s -1.59/21 154} 49. Kb3 {0} 49... Ra7 {
>816kN/s -1.59/21 115} 50. b5 {195} 50... Kc5 {792kN/s -1.63/23 0} 51. Ka4 {67}
>51... Re7 {822kN/s -1.53/21 28} 52. Ka3 {(Kb3) 71} 52... Rg7 {
>804kN/s -1.66/21 139} 53. Kb3 {(Ka4) 0} 53... Rxg5 {821kN/s -1.59/22 159} 54.
>Kc2 {(Ka3) 0} 54... Rg1 {759kN/s -1.69/22 132} 55. Kb2 {0} 55... Rg4 {
>787kN/s -1.63/22 121} 56. Kb3 {68} 56... Re4 {814kN/s -1.63/22 44} 57. Ka3 {70}
>57... Re3+ {816kN/s -1.66/22 64} 58. Kb2 {9} 58... Rh3 {803kN/s -1.59/22 97}
>59. Kc2 {85} 59... Ra3 {791kN/s -1.63/22 23} 60. Kb2 {41} 60... Rg3 {
>811kN/s -1.34/22 40} 61. Kc2 {151} 61... Kb6 {738kN/s -1.59/23 0} 62. Kb2 {154}
>62... Rf3 {695kN/s -1.56/24 0} 63. Kc2 {141} 63... Rh3 {755kN/s -1.47/24 0} 64.
>Kb2 {142} 64... Rh1 {639kN/s -1.50/24 0} 65. Kc2 {63} 65... Rh4 {
>823kN/s -1.59/23 42} 66. Kc3 {(Kb3) 61} 66... Rh5 {819kN/s -1.66/24 130} 67.
>Kc2 {(Kb2) 142} 67... Kc5 {816kN/s -1.56/23 73} 68. Kb3 {0} 68... Rh1 {
>811kN/s -1.63/22 80} 69. Kb2 {(Kc2) 88} 69... Rh4 {805kN/s -1.59/23 116} 70.
>Kb3 {119} 70... Rf4 {726kN/s -1.47/24 0} 71. Ka3 {196} 71... Rf1 {
>740kN/s -1.50/24 0} 72. Kb2 {(Ka2) 164} 72... Rf2+ {834kN/s -1.41/23 115} 73.
>Ka3 {(Kb3) 42} 73... Rf8 {823kN/s -1.41/22 65} 74. Kb3 {41} 74... Re8 {
>815kN/s -1.38/22 41} 75. Kc3 {92} 75... Re5 {807kN/s -1.34/23 37} 76. Kb3 {
>(Kc2) 57} 76... Re2 {822kN/s -1.44/23 96} 77. Ka3 {43} 77... Re7 {
>838kN/s -1.25/22 53} 78. Kb3 {56} 78... Rf7 {839kN/s -1.38/22 28} 79. Kb2 {
>(Kc3) 52} 79... Rf3 {825kN/s -1.28/22 68} 80. Kc2 {0} 80... Rf4 {
>786kN/s -1.63/22 68} 81. Kb3 {73} 81... Kb6 {781kN/s -1.22/23 0} 82. Kc3 {43}
>82... Ka7 {856kN/s -1.13/23 116} 83. Kb3 {(Kd3) 95} 83... Rf3+ {
>937kN/s -1.44/24 55} 84. Kc2 {91} 84... Rf2+ {776kN/s -1.25/24 0} 85. Kc3 {
>(Kd3) 301} 85... Rg2 {928kN/s -1.22/24 53} 86. Kd3 {58} 86... Kb6 {
>763kN/s -1.63/24 0} 87. Kc3 {33} 87... Rg8 {830kN/s -1.44/22 29} 88. Kd2 {
>(Kc2) 71} 88... Kc5 {811kN/s -1.09/23 91} 89. Kc3 {34} 89... Rg2 {
>808kN/s -1.22/23 42} 90. Kb3 {31} 90... Rh2 {816kN/s -1.31/22 36} 91. Ka3 {36}
>91... Kb6 {796kN/s -1.66/22 32} 92. Kb3 {30} 92... Rd2 {846kN/s -1.19/23 58}
>93. Kc3 {26} 93... Ra2 {838kN/s -1.59/24 50} 94. Kb3 {27} 94... Re2 {
>846kN/s -1.44/24 83} 95. Kb4 {(Kc3) 32} 95... Rc2 {723kN/s -#35/18 2}
>96. Kb3
>
>[D]8/8/Pk6/1P6/2P5/1K6/2r5/8 b
Deep Fritz analyzed this position for more than 10 minutes without null move
pruning and there is no mate here even at depth 22.
It says Rc1 1.66 pawns for black
Deep Fritz used the KRKPP tablebases and all the 4 piece tablebases so I guess
that there is no mate here.
Uri
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