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Subject: Re: Draw-bug in Crafty 19.19 (CB)-engine?!

Author: Robert Hyatt

Date: 20:57:47 05/12/05

Go up one level in this thread


On May 12, 2005 at 11:30:34, Peter Ackermann wrote:

>Hi!
>
>I wonder why Crafty repeated the moves in this game:
>
>[Event "Blitz:5'"]
>[Site "Kehl"]
>[Date "2005.05.12"]
>[Round "14"]
>[White "Crafty 19.19"]
>[Black "Junior 9"]
>[Result "1/2-1/2"]
>[ECO "E09"]
>[Annotator "-0.38;0.33"]
>[PlyCount "136"]
>[TimeControl "300"]
>
>{W=11.0 ply; 303kN/s; 1.629 TBAs  B=14.5 ply; 666kN/s; 1.967 TBAs} 1. d4 {0}
>Nf6 {0} 2. Nf3 {0} d5 {0} 3. c4 {0} e6 {0} 4. g3 {0} Be7 {0} 5. Bg2 {0} O-O {0}
>6. O-O {0} c6 {0} 7. Qc2 {0} Nbd7 {0} 8. Nbd2 {0} b6 {0} 9. e4 {0} Bb7 {0} 10.
>e5 {0} Ne8 {0} 11. cxd5 {0} cxd5 {0} 12. Re1 {0} Rc8 {0} 13. Qa4 {0} a5 {
>Beide letzter Buchzug 0} 14. Qd1 {-0.38/10 10} Nb8 {(La6) 0.33/15 9} 15. Nf1 {
>(a4) -0.19/10 13} Nc6 {(Sc7) 0.42/14 9} 16. Re2 {(a3) -0.21/10 8} Nc7 {
>(Dd7) 0.26/14 8} 17. Bf4 {(Le3) -0.19/11 8} Kh8 {(Dd7) 0.30/14 15} 18. Rc2 {
>(h4) -0.05/9 7} g5 {(Dd7) 0.27/14 10} 19. Be3 {0.21/10 8} g4 {(f6) 0.19/14 10}
>20. Ne1 {0.18/10 7} Rg8 {0.32/13 5} 21. Nd3 {(f3) 0.07/9 7} Qd7 {0.27/13 7} 22.
>Nf4 {(a4) 0.12/9 7} f6 {0.22/13 10} 23. exf6 {0.21/9 6} Bxf6 {0.24/12 8} 24.
>Nh5 {(h3) 0.24/9 6} Bg5 {0.36/12 5} 25. Bf4 {(h4) 0.23/9 6} Bxf4 {0.30/12 10}
>26. Nxf4 {0.25/10 6} Qg7 {(Sb5) 0.36/12 6} 27. Rd2 {0.29/10 6} b5 {
>(Tge8) 0.58/12 6} 28. Rc1 {0.64/9 6} Nb4 {(Df7) 1.06/13 11} 29. a3 {
>(Db3) 0.84/10 5} Nc6 {(Sba6) 1.24/13 6} 30. Rdc2 {(Se3) 1.23/9 5} Nxd4 {
>(Dd7) 0.68/12 3} 31. Rxc7 {1.93/11 5} Rxc7 {1.23/13 5} 32. Rxc7 {1.94/11 2}
>Qxc7 {1.24/13 4} 33. Qxd4+ {2.04/13 5} e5 {1.24/14 4} 34. Nxd5 {2.21/13 5} exd4
>{1.00/14 4} 35. Nxc7 {2.10/13 5} Bxg2 {1.05/16 6} 36. Kxg2 {2.26/12 1} d3 {
>(Tg5) 1.34/15 10} 37. Nxb5 {2.43/11 4} Rb8 {1.32/16 5} 38. a4 {2.47/11 4} Rc8 {
>(Td8) 1.34/16 3} 39. Ne3 {2.76/11 4} h5 {1.53/14 3} 40. h3 {(Sd6) 2.63/10 4}
>gxh3+ {1.34/14 5} 41. Kxh3 {2.71/12 4} Rc2 {1.23/14 3} 42. Nd1 {(Kg2) 2.91/12 4
>} Rc4 {1.46/14 5} 43. Nbc3 {3.00/12 4} Kg7 {(Kh7) 1.81/15 5} 44. Kg2 {3.24/11 4
>} h4 {2.33/15 8} 45. gxh4 {3.62/11 5} Rxh4 {2.50/15 7} 46. Kf3 {4.23/11 3} Kf6
>{(Td4) 3.06/16 19} 47. Ke3 {4.58/11 3} Kf5 {(Ke5) 3.04/15 4} 48. Kxd3 {
>4.56/11 3} Ke5 {2.99/14 2} 49. Ke3 {(Se3) 4.51/11 3} Rb4 {3.03/15 3} 50. Ke2 {
>(f3) 4.50/11 4} Rb3 {(Kf5) 3.03/15 2} 51. f3 {4.51/11 3} Kf4 {(Tb4) 3.03/15 2}
>52. Kf2 {4.48/11 3} Ke5 {(Tb8) 3.02/14 3} 53. Kg3 {4.61/11 3} Rb4 {2.63/14 2}
>54. Ne3 {(Kg2) 4.56/11 3} Ke6 {2.05/14 2} 55. f4 {(Se4) 4.61/11 3} Rxb2 {
>2.05/12 1} 56. f5+ {4.59/10 3} Kf6 {2.06/13 2} 57. Ne4+ {4.59/10 2} Kf7 {
>2.05/13 2} 58. Nd5 {4.76/10 3} Ra2 {(Tc2) 2.06/12 3} 59. Nb6 {(Sdc3) 4.71/10 2}
>Rb2 {1.74/11 1} 60. Nd5 {(Sc4) 4.76/11 2} Ra2 {0.00/14 1} 61. Nb6 {4.71/10 2}
>Rb2 {0.00/15 1} 62. Nd7 {4.69/10 2} Rb4 {(Tb1) 1.79/11 1} 63. Ndc5 {4.83/10 2}
>Rd4 {1.92/13 1} 64. Kf4 {(f6) 4.76/10 2} Rd5 {2.39/12 1} 65. Ng5+ {
>(Se6) 4.74/10 2} Kf6 {(Ke7) 2.44/14 3} 66. Nge4+ {(Sce4+) 4.72/10 2} Kf7 {
>(Kg7) 0.00/18 1} 67. Ng5+ {4.74/11 2} Kf6 {0.00/17 0} 68. Nge4+ {4.72/11 2} Kf7
>{Remis angenommen 0.00/20 1} 1/2-1/2
>
>Perhaps it is a bug because it seems that Crafty is not aware that the position
>repeated for third time?
>
>Regards!
>Peter


Something is broken and it isn't crafty.  I had it annotate the above game in
console mode, and it properly brands move 68 as a blunder:

                ({13:+0.01}  68. Nge4+ Kf7 $10)
                ({13:+5.24}  68. Nce4+ Kg7 69. Nf3 Kh6 70. f6 Rd1 71. Ne5 Rf1+ 7
2. Kg4 Kh7 73. Kg5 Kg8 74. Kg6 Re1 75. Kf5 $18)

No idea what the GUI is doing, but it is certainly breaking something somehow,
perhaps with the way it sends moves or positions to Crafty to search...

I would not trust any games played this way, based on this sample...



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