Author: Jason Williamson
Date: 23:30:26 12/17/00
Go up one level in this thread
On December 17, 2000 at 21:53:00, Robert Hyatt wrote:
>On December 17, 2000 at 11:14:13, Dieter Buerssner wrote:
>
>>I think, the following game is interesting for interpreting the 50 moves
>>rule. If I am interpreting correctly, Yace could have won, by mating Crafty
>>in the last possible move, before Crafty could claim a draw. I think there
>>is a subtle bug in my engine, and it seems in other engines as well.
>>In search, after I made a move, I check if the move is legal. Then, when
>>a 3-fold repetition is found, or a draw due to 50 moves rule, I give the
>>move draw score. This seems to work well for for the repetition case,
>>but I forgot about a very important case concerning the 50 moves rule.
>>When the last possible move is a mating move, it should obviously be
>>a win. I hope this interpretation of the rules is correct. Perhaps
>>somebody can confirm this?
>>
>>How does your engine handle this situation?
>>
>
>
>First, and most important, the 50 move rule is _optional_. IE I can play
>50 moves after the last capture or pawn push, you can play 50 moves, and
>the game can continue if we want. One side _can_ claim the draw, but it
>has to be on his move. So If you make 50 moves, and when I make the 50th
>move and mate you, the game is over, because you are mated, and you can't
>claim the draw at that point... If you make 51 moves (and forget to claim
>the draw), I can still mate you and you are mated, because you didn't claim
>it when you had the chance. Once you are mated, it is too late...
>
>
>
>
>
>>If I have tested correcly, Little Goliath and Crafty both don't see the win.
>>Fritz 6a sees the win.
>>
>>I guess, after I fix this problem, it will never ever happen again in a game ...
>>
>>[Event "Computer chess game 0 240 +2 0 0"]
>>[Site "?"]
>>[Date "2000.12.17"]
>>[Round "6"]
>>[White "Crafty 17.13"]
>>[Black "Yace 0.23.33"]
>>[Result "1/2-1/2"]
>>[WhiteElo "0"]
>>[BlackElo "0"]
>>[Timecontrol "0 240 +2 0 0"]
>>[Time "Sun Dec 17 05:43:08 2000"]
>>[last_book_pos "r3kb1r/p2qnppp/1pn1p3/1bppP3/3P4/PBP2N2/1P2NPPP/R1BQR1K1 b kq -
>>2 13"]
>>[last_book_move "13...Bxe2"]
>>[LogFile "logs\yace0006.log"]
>>
>>1. e4 e6 2. d4 d5 3. Nc3 Bb4
>>4. e5 b6 5. a3 Bf8 6. Bb5+ c6
>>7. Ba4 Ba6 8. Nce2 Bb5 9. Bb3 c5
>>10. c3 Nc6 11. Nf3 Qd7 {-0.26} 12. O-O Nge7
>>13. Re1 Bxe2 14. Qxe2 c4 {-0.50} 15. Ba4 h5 {-0.50}
>>16. b3 cxb3 {-0.65} 17. Bxb3 O-O-O {-0.47} 18. Ng5 Qe8 {-0.54}
>>19. Rb1 Kb8 {-0.51} 20. Qa6 Rc8 {-0.50} 21. Ba4 Nf5 {-0.45}
>>22. Bb5 Be7 {-0.41} 23. Qa4 Rf8 {-0.43} 24. Bf4 Ka8 {-0.45}
>>25. Rb2 Rc7 {-0.45} 26. Reb1 Qc8 {-0.51} 27. Ba6 Qd8 {-0.33}
>>28. Nf3 g5 {-0.39} 29. Bc1 g4 {-0.20} 30. Ne1 Na5 {-0.20}
>>31. Rc2 Qe8 {-0.09} 32. Bb5 Qc8 {0.12} 33. Bb2 f6 {0.17}
>>34. exf6 Bxf6 {0.12} 35. Re2 Nd6 {0.13} 36. Bd3 Nac4 {0.12}
>>37. Bc1 e5 {0.10} 38. dxe5 Bxe5 {0.15} 39. Qd1 Rc5 {0.22}
>>40. Bxc4 dxc4 {0.27} 41. a4 Qc6 {0.34} 42. Qc2 Rd5 {0.41}
>>43. Ba3 Rd8 {0.40} 44. Rd2 Rxd2 {1.00} 45. Qxd2 Qc7 {0.82}
>>46. Qe3 Qh7 {0.38} 47. Bxd6 Bxd6 {0.51} 48. Qg5 Be7 {0.63}
>>49. Qc1 Bc5 {0.69} 50. Rb2 Rf8 {0.67} 51. Re2 Qd7 {0.69}
>>52. Qg5 Qf7 {0.63} 53. Qd2 Qf5 {0.56} 54. Nc2 Qd3 {0.57}
>>55. Qe1 Qd7 {0.97} 56. Rd2 Qe8 {0.53} 57. Qxe8+ Rxe8 {0.44}
>>58. Kf1 a6 {0.41} 59. Rd7 Kb8 {0.37} 60. f4 gxf3 {0.41}
>>61. gxf3 Rf8 {0.44} 62. Ne1 Kc8 {0.48} 63. Rd5 h4 {0.45}
>>64. Rh5 Be7 {0.51} 65. Ke2 Bf6 {0.59} 66. Nc2 Re8+ {0.49}
>>67. Ne3 Bxc3 {0.58} 68. Rxh4 b5 {0.59} 69. Re4 Rxe4 {0.50}
>>70. fxe4 Bb2 {0.48} 71. axb5 axb5 {0.33} 72. h4 Kd7 {0.39}
>>73. h5 Ke6 {0.48} 74. h6 Kf6 {0.77} 75. Nf5 Kg6 {0.24}
>>76. Nd6 c3 {0.15} 77. Kd3 b4 {0.04} 78. e5 Kxh6 {0.04}
>>79. e6 b3 {0.04} 80. e7 c2 {0.03} 81. e8=Q c1=Q {0.03}
>>82. Qf8+ Kh5 {0.00} 83. Qf7+ Kh4 {0.00} 84. Qxb3 Qf1+ {0.00}
>>85. Ke4 Qe1+ {0.00} 86. Kd5 Qe5+ {0.00} 87. Kc6 Bc3 {0.00}
>>88. Nc4 Qe6+ {0.06} 89. Kc7 Be5+ {0.06} 90. Kd8 Qd5+ {0.06}
>>91. Ke8 Qc6+ {0.06} 92. Ke7 Bf6+ {0.06} 93. Kf7 Bd4 {0.07}
>>94. Qb4 Kh5 {0.08} 95. Nd6 Qd7+ {0.08} 96. Kf8 Bg7+ {0.91}
>>97. Kg8 Be5 {0.91} 98. Nf7 Qc8+ {0.91} 99. Kh7 Qf5+ {0.90}
>>100. Kg8 Qc8+ {0.90} 101. Kh7 Qc2+ {0.90} 102. Kg8 Qg6+ {0.90}
>>103. Kf8 Bg7+ {0.90} 104. Ke7 Qf6+ {0.91} 105. Kd7 Qxf7+ {0.91}
>>106. Kc6 Qe8+ {0.92} 107. Kb6 Qb8+ {0.92} 108. Ka5 Qa8+ {0.92}
>>109. Kb6 Qd5 {0.93} 110. Qb5 Bd4+ {0.92} 111. Ka5 Bc5 {0.92}
>>112. Qc4 Qd8+ {0.92} 113. Kb5 Qb6+ {0.92} 114. Ka4 Qd6 {0.91}
>>115. Kb5 Qb6+ {0.91} 116. Ka4 Qc6+ {0.91} 117. Ka5 Bb6+ {0.91}
>>118. Kb4 Qd6+ {0.91} 119. Kb5 Bd4 {0.91} 120. Qc6 Qe5+ {0.91}
>>121. Kc4 Qf4 {0.91} 122. Qd5+ Be5+ {0.91} 123. Kb5 Qf5 {0.91}
>>124. Kc4 Kg5 {0.91} 125. Qd8+ Kh6 {0.91} 126. Qd3 Qc8+ {0.93}
>>127. Kb5 Qb7+ {0.91} 128. Kc5 Qb8 {0.91} 129. Kc4 Qb6 {0.91}
>>130. Qd5 Qa6+ {0.91} 131. Kc5 Qa5+ {0.91} 132. Kc4 Qc3+ {0.91}
>>133. Kb5 Qe3 {0.91} 134. Qg8 Qe4 {0.91} 135. Qg1 Qd3+ {0.92}
>>136. Kb4 Bd6+ {0.92} 137. Ka5 Qc4 {0.92} 138. Kb6 Bc7+ {0.92}
>>139. Kb7 Bf4 {0.92} 140. Kb6 Qb4+ {0.93} 141. Kc6 Qe4+ {0.93}
>>142. Kb5 Qd3+ {0.93} 143. Kc6 Qf3+ {0.93} 144. Kb5 Qe2+ {0.93}
>>145. Kc6 Qf3+ {0.92} 146. Kb5 Qd3+ {0.92} 147. Kc6 Qe4+ {0.92}
>>148. Kb5 Qe2+ {0.92} 149. Kb4 Bd2+ {0.93} 150. Kb3 Qd3+ {17.87}
>>151. Ka2 Qc4+ {Mat11} 152. Ka1 Qc3+ {0.00} 153. Ka2 Kh5 {0.00}
>>154. Qh2+ Kg6 {0.00} 155. Qg1+ Bg5 {0.00} 1/2-1/2 {Draw}
>>
>>I think, the forced win is
>>
>>152...Bc3+ 153. Kb1 Qb3+ 154. Kc1 Qb2+ 155. Kd1 Qd2#
>>
>>Regards,
>>Dieter
So what do you do there, do you test to see if its mate first or immeditately
test to see if its a draw?
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