Author: Richard Pijl
Date: 07:12:41 01/30/04
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>[Event "Computer chess game"]
>[Site "DUAL"]
>[Date "2004.01.30"]
>[Round "7"]
>[White "Amateur 2.4"]
>[Black "BlackBishop 0.9.5z"]
>[Result "1/2-1/2"]
>[TimeControl "40/180"]
>
>1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Qb6 8.
>Qd2 Qxb2 9. Rb1 Qa3 10. f5 Nc6 11. fxe6 fxe6 12. Nxc6 bxc6 13. e5 dxe5 14.
>Bxf6 gxf6 15. Ne4 Be7 16. Be2 h5 17. Rb3 Qa4 18. Nxf6+ Bxf6 19. c4 Bh4+ 20.
>g3 Be7 21. O-O h4 22. Bd3 Bc5+ 23. Kh1 Rg8 24. Be2 Bd7 25. Bh5+ Kd8 26. Rb7
>Bd4 27. Rf7 c5 28. Rbxd7+ Qxd7 29. Qa5+ Kc8 30. Rxd7 Kxd7 31. Bf7 Rgb8 32.
>gxh4 Rb1+ 33. Kg2 Rf8 34. Qa4+ Ke7 35. Bh5 Rc1 36. Qc6 Rf2+ 37. Kg3 Rc3+
>38. Kg4 Kf6 39. Bf7 Kxf7 40. Qd7+ Kf8 41. Qd6+ Kf7 42. Qd7+ Kf6 43. Qd8+
>Kg7 44. Qe7+ Rf7 45. Qxe6 Rc2 46. a4 Rf4+ 47. Kh5 Rxh2 48. Qg6+ Kf8 49.
>Qd6+ Kg7 50. Qg6+ Kf8 51. Qd6+ Ke8 52. Qe6+ Kd8 53. Qd6+ Kc8 54. Qc6+ Kb8
>55. Qb6+ Ka8 56. Qc6+ Ka7 57. Qc7+ Ka8 58. Qc8+ Ka7 59. Qc7+ Ka8 60. Qc8+
>Ka7 61. Qc7+
>{Draw by repetition} 1/2-1/2
>
>I'm not sure which move is here the best to avoid the perpetual check, if it's
>not to late at that point:
>[d]8/6k1/p3Q3/2p1p2K/P1Pb1r1P/8/2r4P/8 b - - 0 47
>At this point, BlackBishop needs 12 plys without my perpetual check detection to
>see that Rxh2 is a draw and switched later to Rg2.
The Baron switches to Rg2 in just over 3 seconds on a P3-500. When forcing Rxh2,
it sees a draw in less than a second. Cause: Repetition of position.
I do not have any special perpetual detection, just repetition detection, and
only check evasions in qsearch (so no checking moves).
Richard.
>
>How does others recognize draw by perpetual check?
>Or is it normal that the checking side finds such pertual check lines faster?
>Any comments are welcome.
>
>regards
>Andreas
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