Author: Will Singleton
Date: 00:19:41 03/24/03
Go up one level in this thread
On March 24, 2003 at 02:52:40, Will Singleton wrote:
>On March 24, 2003 at 02:25:33, Bernhard Bauer wrote:
>
>>On March 24, 2003 at 02:07:31, Will Singleton wrote:
>>
>>>Position from Baron – Amateur bm Qxc2
>>>[D]2rr3k/pb3ppp/4p3/4P3/1n1B3R/1P4P1/P1q4P/1Q1RKB2 w - - 0 30
>>>
>>>For some reason, Ruffian and Crafty have a very tough time with this one. I
>>>wonder whether this could be due to some similarity between them. A problem in
>>>repetition detection, perhaps? On my machine, amd 1.6ghz:
>>>
>>> Fail-low solution
>>>Yace 0:15 0:20
>>>CM 0:15 0:30
>>>Shredder 0:35 0:45
>>>Amateur 0:20 0:50
>>>Ruffian 2:34 3:54
>>>Crafty 5:42 > 9 minutes
>>>
>>>---------------------------------
>>>[Event "Computer chess game"]
>>>[Site "MICRON"]
>>>[Date "2003.03.23"]
>>>[Round "1"]
>>>[White "The Baron 0.99.5a"]
>>>[Black "Amateur 2.44"]
>>>[Result "0-1"]
>>>[TimeControl "40/600"]
>>>
>>>1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. Qc2 c6 7. O-O Nbd7 8.
>>>Nbd2 b6 9. e4 Bb7 10. e5 Ne8 11. b3 Rc8 12. Bb2 c5 13. Rac1 cxd4 14. Nxd4
>>>Kh8 15. Rfe1 Nc7 16. cxd5 Nxd5 17. Qb1 Nc5 18. Red1 Qd7 19. Ne4 Rfd8 20.
>>>Ne2 Qb5 21. Nd4 Qa6 22. Nxc5 Bxc5 23. Bf1 Qa5 24. Rc4 b5 25. Nxb5 Qxb5 26.
>>>Rh4 Bxf2+ 27. Kxf2 Qc5+ 28. Bd4 Qc2+ 29. Ke1 Nb4 30. Bxa7 Qc3+ 31. Kf2 Qf3+
>>>32. Kg1 Qh1+ 33. Kf2 Qf3+ 34. Kg1 h5 35. Rd6 g5 36. Rh3 Rxd6 37. exd6 Rc2
>>>38. Qxc2 Nxc2 39. d7 Qd5 40. Bb6 Qxd7 41. Rxh5+ Kg7 42. Rxg5+ Kf6 43. Rb5
>>>Qd1 44. a3 Bc6 45. Rb4 Nxb4 46. g4 Nd3 47. Bd4+ Ke7 48. Bc5+ Nxc5 49. h4
>>>{Baron resigns} 0-1
>>
>>Crafty 19.3 needs 28 sec on an AMD 1,8 GHz. So I can't see a very tough time.
>>Regards
>>Bernhard
>
>Very interesting. I was using Crafty 19.1. I just ran the position on 19.2 and
>19.3, confirming your results with 19.3. 19.2, however, behaves likes 19.1,
>taking several minutes. I'm off to check the source changes.
>
More interesting. 19.3 has rewritten the repetition code. As I pointed out in
the original post, a problem with repetition detection might cause difficulty
with this position. What do you know.
Will
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