Author: Joachim Rang
Date: 13:11:30 10/19/05
Go up one level in this thread
On October 18, 2005 at 15:40:22, Uri Blass wrote:
>[Event "CEGT 40/40 (2 Ghz)"]
>[Site "CEGT"]
>[Date "2005.10.17"]
>[Round "23.1"]
>[White "Shredder 9 Columbus'egg 9g"]
>[Black "Fruit 2.2 Uri"]
>[Result "1-0"]
>[ECO "D46"]
>[PlyCount "331"]
>[EventDate "2005.09.05"]
>[EventType "tourn"]
>[TimeControl "40/1080:0"]
>
>1. d4 {0} Nf6 {0} 2. c4 {0} e6 {0} 3. Nf3 {0} d5 {0} 4. Nc3 {0} c6 {0} 5. e3 {0
>} Nbd7 {0} 6. Qc2 {0} Bd6 {0} 7. Bd3 {0} O-O {0} 8. O-O {0} dxc4 {0} 9. Bxc4 {0
>} b5 {0} 10. Be2 {0} Bb7 {0} 11. Rd1 {0.35/14 41} b4 {(De7) 0.16/13 32} 12. Ne4
>{0.34/14 14} Nxe4 {0.18/14 41} 13. Qxe4 {0.34/16 34} a5 {(Da5) 0.20/13 64} 14.
>Bd3 {(Ld2) 0.60/15 28} g6 {0.14/13 27} 15. Be2 {(Ld2) 0.48/15 79} Qe7 {
>(Te8) 0.06/13 24} 16. Qd3 {(Ld2) 0.52/15 44} f5 {(Tad8) 0.28/13 27} 17. e4 {
>1.20/15 39} Ba6 {0.42/13 43} 18. Qc2 {1.16/15 19} fxe4 {0.40/14 26} 19. Qxe4 {
>1.18/17 60} Nf6 {0.49/14 39} 20. Qc2 {1.18/17 63} Bxe2 {0.57/13 41} 21. Qxe2 {
>1.13/15 6} Nd5 {0.49/14 26} 22. Bg5 {(Lh6) 1.17/16 28} Qd7 {0.57/15 41} 23. Re1
>{1.18/16 31} Rfe8 {(Tae8) 0.56/15 48} 24. Rac1 {1.32/15 35} a4 {0.66/15 40} 25.
>Bd2 {(Dc4) 1.31/15 41} Qc7 {(Tac8) 0.69/13 41} 26. Qd3 {(h4) 1.34/15 44} a3 {
>(Tac8) 0.72/13 43} 27. b3 {1.37/16 31} Re7 {(Tac8) 0.76/13 53} 28. Rc4 {
>(Te4) 1.58/15 56} Kh8 {(Dd7) 0.78/12 20} 29. Qe4 {(Tec1) 1.73/15 32} Rb8 {
>0.83/13 25} 30. Bg5 {(Dg4) 1.69/15 32} Ree8 {0.78/14 39} 31. Qg4 {
>(Dh4) 1.68/15 34} Qd7 {(Kg8) 0.79/13 30} 32. Bd2 {(Sd2) 1.67/15 54} Rbc8 {
>(Kg8) 0.68/13 21} 33. Qe4 {(Tc2) 1.81/15 19} Rb8 {(Sf6) 0.87/14 135} 34. Ne5 {
>1.81/10 19} Bxe5 {0.87/13 25} 35. Qxe5+ {1.84/10 11} Kg8 {0.93/12 20} 36. Bh6 {
>(Tec1) 1.66/10 33} Rb7 {(Tb6) 0.55/10 25} 37. Bd2 {(Tc2) 1.35/16 68} Rbb8 {
>(Tb5) 0.00/19 43} 38. h4 {1.92/16 23} Rb5 {0.94/14 10} 39. Qg3 {2.08/15 15} Rf8
>{(Kh8) 1.01/14 12} 40. h5 {2.23/16 22} Rf6 {1.08/14 14} 41. Bg5 {
>(Tec1) 2.20/15 20} Rf5 {1.19/15 31} 42. hxg6 {2.15/16 40} hxg6 {1.27/14 20} 43.
>Bd2 {2.08/17 44} Kf7 {1.41/15 71} 44. Re4 {1.90/16 39} Rh5 {1.30/14 22} 45. Rh4
>{(Tg4) 1.90/15 23} Rxh4 {1.20/16 37} 46. Qxh4 {1.89/16 11} Kg8 {1.28/17 44} 47.
>Qg4 {(Dg5) 1.92/17 27} Kf7 {1.21/16 20} 48. Qh4 {(Dh3) 1.92/17 22} Kg8 {
>0.00/20 36} 49. Qg3 {1.93/18 48} Kh7 {(Kf7) 1.22/15 33} 50. Qg5 {2.19/17 19}
>Qe8 {1.28/16 18} 51. Rc1 {(Dh4+) 2.18/16 20} Kg8 {(Tb7) 1.18/15 34} 52. Qg4 {
>(Dg3) 2.13/16 22} Kg7 {1.19/15 28} 53. Qg3 {(Te1) 2.14/16 25} Qd7 {1.11/15 16}
>54. Qh4 {(De5+) 2.01/16 56} Kg8 {(Sf6) 1.21/15 22} 55. Qh6 {2.15/17 28} Qe8 {
>1.22/16 25} 56. Qh3 {2.16/18 76} Nf6 {1.22/10 32} 57. Qf3 {(Tc4) 2.16/16 16}
>Nd5 {1.25/14 15} 58. Re1 {2.19/15 12} Qf7 {(De7) 1.19/15 40} 59. Qh3 {
>(Dg3) 2.48/15 10} Qf5 {(Sc7) 1.08/15 28} 60. Qh2 {(Dg3) 2.14/16 69} Rb7 {
>(Kf7) 0.41/14 25} 61. Qg3 {0.82/14 18} Rf7 {0.49/14 18} 62. Rc1 {1.07/15 24}
>Kg7 {(De4) 0.59/14 24} 63. Qh4 {(De5+) 1.29/15 26} Nf4 {0.34/14 25} 64. Re1 {
>(Lxf4) 0.83/14 71} g5 {(Kg8) 0.22/14 21} 65. Qg3 {0.65/17 24} Rd7 {0.30/15 28}
>66. Bxf4 {-0.06/17 80} Qxf4 {0.09/15 6} 67. Qh3 {(Dxf4) -0.04/16 16} g4 {
>(Td6) 0.00/15 15} 68. Qh4 {0.07/16 18} Rxd4 {0.00/15 16} 69. Qe7+ {0.07/16 13}
>Qf7 {0.00/17 22} 70. Qg5+ {0.07/16 14} Qg6 {0.00/18 30} 71. Qc5 {
>(De7+) 0.07/16 30} Qf6 {-0.40/14 25} 72. Qxc6 {(Da7+) -0.02/15 22} Rd2 {
>0.00/15 51} 73. Qc7+ {-0.02/15 24} Kg6 {0.00/16 29} 74. Rf1 {(Dg3) -0.03/15 8}
>Rxa2 {-0.67/14 16} 75. Qc4 {-0.03/15 21} Kg5 {-0.62/14 34} 76. Qc5+ {
>-0.03/14 18} e5 {(Kh6) -0.63/15 28} 77. Qxb4 {0.02/12 2} Rc2 {-0.57/15 35} 78.
>Qe4 {(f3) 0.03/13 8} Qf5 {(Tb2) -0.71/14 20} 79. Qb7 {0.03/14 9} a2 {
>-0.69/13 21} 80. Qg7+ {0.02/14 11} Kh5 {0.00/14 18} 81. Qh8+ {0.01/14 19} Kg6 {
>(Kg5) 0.00/18 34} 82. Qg8+ {0.01/16 41} Kh6 {(Kh5) 0.00/18 40} 83. Qh8+ {
>0.01/15 25} Qh7 {(Kg5) 0.00/18 38} 84. Qxe5 {(Df6+) 0.19/12 7} Qf7 {
>(Dg7) 0.00/15 41} 85. b4 {(De4) 0.43/13 38} Kg6 {(Dg7) 0.00/14 26} 86. Qe3 {
>(b5) 0.34/14 38} Qf6 {0.00/14 22} 87. Qd3+ {(De4+) 0.35/14 39} Qf5 {0.00/15 12}
>88. Qd4 {(De3) 0.11/15 37} Kf7 {(Dg5) 0.00/14 37} 89. Re1 {(Da7+) 0.78/15 35}
>Kg6 {(Tc7) 0.55/14 87} 90. Rd1 {(b5) 0.54/14 96} Kf7 {(Te2) 0.00/13 19} 91.
>Qa7+ {0.54/14 59} Kg6 {0.00/15 28} 92. Qe3 {0.54/14 43} Kh5 {0.00/14 18} 93.
>Qd4 {(De8+) 0.44/13 42} Kg5 {0.00/13 18} 94. g3 {(De3+) 0.48/14 34} Re2 {
>0.00/13 22} 95. Kf1 {(Dg7+) 0.41/13 24} Qb5 {(De5) 0.00/12 42} 96. Kg1 {
>(Dg7+) 0.73/1 30} Qf5 {0.00/10 24} 97. Kf1 {0.41/13 18} Qb5 {(De5) 0.00/15 17}
>98. Qf4+ {0.40/12 14} Kh5 {0.85/14 17} 99. Kg1 {0.39/14 20} Qe5 {0.84/14 19}
>100. Qxe5+ {0.42/16 21} Rxe5 {0.77/23 17} 101. Kf1 {0.46/21 16} Kg6 {
>(Tb5) 0.77/25 25} 102. Ra1 {0.49/21 14} Re4 {(Tb5) 0.77/26 26} 103. Rxa2 {
>(b5) 0.47/22 21} Rxb4 {0.77/26 20} 104. Ke2 {0.46/21 24} Rb3 {(Tb5) 0.77/26 33}
>105. Ra6+ {0.49/21 20} Kg5 {(Kf5) 0.77/24 28} 106. Ra5+ {(Kd2) 0.44/21 17} Kf6
>{(Kg6) 0.77/25 27} 107. Rd5 {(Ta4) 0.44/22 23} Rb8 {(Kg6) 0.77/22 17} 108. Kd3
>{(Ke3) 0.43/20 15} Ra8 {(Kg6) 0.77/23 25} 109. Rc5 {(Ke3) 0.42/21 21} Ra3+ {
>0.76/22 32} 110. Ke4 {(Ke2) 0.42/21 15} Ra4+ {0.76/23 18} 111. Kd3 {
>(Ke3) 0.41/23 21} Ra3+ {0.00/30 18} 112. Ke4 {0.41/23 15} Ra4+ {
>(Ta2) 0.00/30 18} 113. Ke3 {0.32/23 15} Ra3+ {0.76/20 24} 114. Kd4 {0.36/23 15}
>Ra2 {0.76/21 23} 115. Rc8 {(Tc6+) 0.36/23 20} Kf5 {0.76/20 20} 116. Ke3 {
>(Tb8) 0.39/22 18} Ra3+ {0.76/22 28} 117. Ke2 {(Kd2) 0.39/24 19} Ra2+ {
>0.76/24 34} 118. Kf1 {0.39/24 20} Ra1+ {(Kf6) 0.76/26 29} 119. Kg2 {0.41/25 21}
>Rd1 {(Ta2) 0.76/27 18} 120. Rf8+ {(Tc5+) 0.39/23 22} Kg5 {0.76/29 26} 121. Rb8
>{(Tg8+) 0.40/25 17} Kf5 {(Td2) 0.76/30 39} 122. Rb5+ {0.40/26 36} Kg6 {
>(Kf6) 0.76/31 23} 123. Rb8 {(Tc5) 0.40/27 60} Kf5 {(Td2) 0.00/37 20} 124. Rf8+
>{0.42/28 26} Kg5 {(Kg6) 0.00/38 22} 125. Rc8 {0.42/28 45} Kf5 {(Td4) 0.00/41 30
>} 126. Rc5+ {0.41/25 40} Ke6 {(Kg6) 0.76/20 24} 127. Rc4 {(Ta5) 0.41/26 33} Kf5
>{0.76/19 21} 128. Rc5+ {(Tf4+) 0.41/28 52} Ke6 {0.00/42 29} 129. Rh5 {
>0.40/26 39} Rb1 {(Kf6) 0.76/18 24} 130. Rg5 {0.40/25 18} Rb4 {0.76/17 24} 131.
>Rc5 {(Kf1) 0.37/25 33} Rb7 {(Tb2) 0.76/15 34} 132. Kf1 {(Tc6+) 0.38/23 17} Rb1+
>{(Kf6) 0.77/18 49} 133. Ke2 {0.40/21 4} Rb2+ {(Tb3) 0.77/19 16} 134. Ke3 {
>(Ke1) 0.44/21 5} Kf6 {(Tb3+) 0.77/19 16} 135. Rc4 {(Tc6+) 0.42/23 26} Kg5 {
>0.77/22 30} 136. Rc5+ {(Tc6) 0.44/24 24} Kf6 {0.00/35 16} 137. Rd5 {0.40/24 21}
>Rb3+ {0.77/22 43} 138. Rd3 {0.38/25 38} Rb2 {0.77/22 34} 139. Rd4 {
>(Tc3) 0.38/23 44} Kg5 {(Kf5) 0.77/20 17} 140. Rd5+ {0.30/22 29} Kf6 {0.77/20 23
>} 141. Rd2 {(Td3) 0.30/22 27} Rxd2 {(Tb3+) 0.76/20 27} 142. Kxd2 {#25/49 0} Ke6
>{#25/1 0} 143. Ke2 {#24/1 0} Kd5 {#23/1 0} 144. Kd3 {(f3) #23/1 0} Ke5 {#23/1 0
>} 145. Ke3 {#22/1 0} Kf5 {#22/1 0} 146. Kd4 {#21/1 0} Kf6 {#20/1 0} 147. Ke4 {
>#20/1 0} Kg5 {#20/1 0} 148. Ke5 {#19/1 0} Kg6 {#18/1 0} 149. Kf4 {#18/1 0} Kf7
>{#17/1 0} 150. Kxg4 {#17/1 0} Kf6 {#17/1 0} 151. f4 {#16/1 0} Kg6 {
>(Ke6) #16/1 0} 152. f5+ {#15/1 0} Kf6 {#15/1 0} 153. Kf4 {#14/1 0} Kf7 {#14/1 0
>} 154. g4 {#13/1 0} Kf6 {(Ke7) #12/1 0} 155. g5+ {#12/1 0} Kf7 {#11/1 0} 156.
>Ke5 {#11/1 0} Kf8 {(Ke7) #10/1 0} 157. Ke6 {#10/1 0} Kg7 {(Ke8) #9/1 0} 158.
>f6+ {(g6) #9/1 0} Kg6 {#8/1 0} 159. f7 {#8/1 0} Kg7 {#8/1 0} 160. Ke7 {#7/1 0}
>Kg6 {#7/1 0} 161. f8=Q {#6/1 0} Kxg5 {#5/1 0} 162. Qf3 {#5/1 0} Kh4 {#5/1 0}
>163. Ke6 {#4/1 0} Kg5 {#4/1 0} 164. Qg3+ {#3/1 0} Kh5 {#2/1 0} 165. Kf5 {#2/1 0
>} Kh6 {#2/1 0} 166. Qg6# {#1/1 0} 1-0
>
>
>
>229: Shredder 9 Columbus'egg 9g - Fruit 2.2 Uri, CEGT 40/40 (2 Ghz) 2005
>8/8/5k2/8/6p1/4K1P1/1r1R1P2/8 b - - 0 1
>
>In the CEGT game Fruit2.2 Uri got depth 20,played Rxd2 and lost
>
>I wonder if the problem
>I also wonder about the small depth that fruit got in previous moves.
>
>Analysis by Fruit 2.2 Uri:
>
>141...Rxd2 142.Kxd2
> ± (0.90) Depth: 1/2 00:00:00
>141...Rxd2 142.Kxd2 Ke5
> ± (0.86) Depth: 2/6 00:00:00
>141...Rxd2 142.Kxd2 Ke5 143.Kd3
> ± (0.78) Depth: 3/6 00:00:00
>141...Rxd2 142.Kxd2 Ke5 143.Kd3 Kd5
> ± (0.98) Depth: 4/8 00:00:00
>141...Rb3+ 142.Ke4 Ke6 143.Re2 Kd6
> ± (0.90) Depth: 4/10 00:00:00
>141...Rb3+ 142.Kd4 Rb4+ 143.Kc5 Rb8 144.Rd6+ Ke7 145.Ra6
> ± (0.90) Depth: 5/12 00:00:00
>141...Rb3+ 142.Kd4 Rb4+ 143.Kd5 Rb8 144.Ra2 Rd8+ 145.Kc4 Rc8+ 146.Kd4
> ± (0.86) Depth: 6/14 00:00:01 21kN
>141...Rb3+ 142.Kd4 Rb4+ 143.Kd5 Rb8 144.Rc2 Kf5 145.Rc5 Rb2 146.Kd4+ Ke6
> ± (0.86) Depth: 7/16 00:00:01 51kN
>141...Rb3+ 142.Kd4 Rb4+ 143.Kc5 Rb8 144.Rd4 Rb2 145.Rxg4 Rxf2 146.Re4 Rc2+
>147.Kd5
> ± (0.87) Depth: 8/17 00:00:01 144kN
>141...Rb7 142.Ke4 Rb4+ 143.Kd5 Rb8 144.Rc2 Kf5 145.Rc5 Rb2 146.Kd4+ Ke6
> ± (0.86) Depth: 8/17 00:00:01 172kN
>141...Rb7 142.Ke4 Rb4+ 143.Kd5 Rb8 144.Rc2 Kf5 145.Kd6 Rd8+ 146.Ke7 Rd1 147.Rc5+
>Ke4
> ± (0.83) Depth: 9/18 00:00:01 225kN
>141...Rb7 142.Rc2 Kf5 143.Rc5+ Kf6 144.Rc4 Kf5 145.Rf4+ Kg5 146.Ra4 Rb2 147.Ra5+
>Kf6
> ± (0.84) Depth: 10/19 00:00:01 389kN
>141...Rb8 142.Ke4 Rb4+ 143.Kd3 Ke5 144.Ra2 Rb3+ 145.Kd2 Rb7 146.Ra5+ Ke4
>147.Ra4+ Kf3 148.Rf4+ Kg2 149.Rxg4 Kxf2
> ± (0.83) Depth: 10/21 00:00:01 517kN
>141...Rb8 142.Ke4 Rb4+ 143.Kd3 Ke5 144.Ra2 Rb3+ 145.Kd2 Ke4 146.Ra4+ Kf3 147.Kc2
>Rb7 148.Rf4+ Ke2
> ± (0.80) Depth: 11/21 00:00:01 656kN
>141...Rb8 142.Ke4 Rb4+ 143.Kd3 Ke5 144.Ra2 Rb3+ 145.Kc4 Rb8 146.Kc3 Kf5 147.Ra5+
>Ke4 148.Rc5 Rd8 149.Rc4+ Kf5
> ± (0.83) Depth: 12/24 00:00:02 1078kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Ra6
>Rc8+ 148.Kd3 Rd8+ 149.Kc4
> ± (0.82) Depth: 12/24 00:00:02 1459kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Kc4
>Rd8 148.Ra5+ Ke4 149.Rb5
> ± (0.78) Depth: 13/26 00:00:02 2116kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Kc4
>Rd8 148.Ra5+ Ke4 149.Ra6 Rd2 150.Re6+ Kf5
> ± (0.78) Depth: 14/27 00:00:03 2855kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Kc4
>Rd8 148.Kc5 Rc8+ 149.Kb4 Ke6 150.Ra5
> ± (0.78) Depth: 15/28 00:00:04 3643kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Kc4
>Rd8 148.Rb2 Ke6 149.Re2+ Kf5 150.Re1 Rd2
> ± (0.78) Depth: 16/29 00:00:05 4682kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Kc4
>Rd8 148.Rb2 Ke6 149.Kc3 Kf5 150.Rb4 Rc8+ 151.Kd3
> ± (0.78) Depth: 17/33 00:00:05 6403kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Kc4
>Rd8 148.Rb2 Ke6 149.Kc3 Kf5 150.Rb4 Rc8+ 151.Kd3 Rd8+ 152.Rd4
> ± (0.78) Depth: 18/33 00:00:07 8637kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Ra6+ Kg5 146.Rd6 Rb2 147.Ke3
>Kf5 148.Rd7 Ke5 149.Re7+ Kf5 150.Rc7 Kf6 151.Rc5 Ra2 152.Rb5 Ke6
> ± (0.78) Depth: 19/36 00:00:10 13415kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Ra6+ Kg5 146.Ra3 Rb2 147.Ke3
>Kf5 148.Rc3 Ke6 149.Rc4 Kf5 150.Rc7 Kf6 151.Rc5 Ra2 152.Rb5 Ke6
> ± (0.78) Depth: 20/37 00:00:15 21165kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Ra6+ Kg5 146.Ra3 Rb2 147.Ke3
>Kf5 148.Rc3 Ke6 149.Rc7 Kf5 150.Rf7+ Kg5 151.Rd7 Rb3+ 152.Rd3 Rxd3+ 153.Kxd3 Kf6
>154.Kc4 Ke5 155.Kc5
> ± (0.78) Depth: 21/38 00:00:19 27619kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Ra6+ Kg5 146.Ra3 Rb2 147.Ke3
>Kf5 148.Rc3 Ke6 149.Rc6+ Kf5 150.Rc1 Kf6 151.Re1 Kf5 152.Re2 Rxe2+ 153.Kxe2 Ke5
>154.Ke3 Kd5 155.Kf4
> ± (0.78) Depth: 22/41 00:00:25 37517kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Re2
>Rc8+ 148.Kb3 Rc1 149.Re8 Rb1+ 150.Kc3 Rh1 151.Re2 Rc1+ 152.Rc2 Rxc2+ 153.Kxc2
>Ke4 154.Kd2 Kd4 155.Ke2 Ke5 156.Ke3
> ± (0.78) Depth: 23/42 00:00:46 69759kN
>141...Rb3+ 142.Kd4 Kf5 143.Ra2 Rb8 144.Ra5+ Kg6 145.Kc3 Rf8 146.Ra2 Kf5 147.Re2
>Rc8+ 148.Kb3 Rc1 149.Re7 Rb1+ 150.Kc2 Ra1 151.Re2 Ra2+ 152.Kd3 Rxe2 153.Kxe2 Kf6
>154.Kd3 Ke5 155.Ke3 Kd5 156.Kf4
> ± (0.78) Depth: 24/42 00:00:55 85261kN
>
>(, 18.10.2005)
>
>
>
>Fruit2.2 Uri can see at small depth that Rxd2 is bad and if it did not see it
>then it is possible that it lost the game because of hash bug.
>
>Unfortunately I could not reproduce the bug but I did not try to replay all the
>game but only the last moves.
>
>It is possible that history pruning=50 increases the effect of the hash bug so
>this is the reason that fruit2.2 Uri is weaker at long time control but it is
>also possible that the hardware of somebody in the CEGT team is broken and I
>cannot reproduce the small depthes that Fruit Uri got in previous moves at CEGT
>time control.
>
>It is also possible that Fruit WCCC is different than Fruit2.2 and there is a
>bug in changing parameters in fruit WCCC that is not in Fruit2.2
>
>I wonder if you have a logfile of the relevant game that you can send to Fabien
>so he can reproduce the problem.
>
>Uri
Hi Uri,
an interesting observation. Rxd2 is not reproducible with any version so the
reason is the hash table. Whether this is a bug of the hash table or not I can't
say. Definitely with filled hash other moves are chosen than with empty hash.
Probably it is a bug since Fruit has most probably hash bugs but we have no clue
how to identify it and remove it. Furthermore using hash tables without bugs is
nowadays with a complex search impossible.
This position however shows another weakness of Fruit which is present until
now: Fruit has problems to avoid trading down in lost pawn endgames. I observed
this several times and Fabien is also aware of that. There are workarounds to
prevent this but none of them are sound so we stayed away from using it. But
this problem will be tackled in future.
The good news is, this is one of the very few exception where TBs help and the
next Fruit 2.2.1 won't loose such a game even with the existing hash table bugs
and the poor pawn endgame eval. :-)
Joachim
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.