Author: Frank Phillips
Date: 09:54:02 01/10/03
Go up one level in this thread
On January 10, 2003 at 11:58:21, Dieter Buerssner wrote:
>On January 10, 2003 at 11:19:40, Frank Phillips wrote:
>
>>>>>8/p2RP3/4r3/3P1pp1/8/P2k1K2/8/8 b - - 0 47
>
>>>>I get no indication of a draw even in the second (easy) position. I tried
>>>>messing with extensions and the fifty move counter (changing it to a much
>>>>smaller number), but still no joy.....
>
>One idea would be to try it without hash (if you extend checks, it should be
>findable without hash), and/or without null move.
>
>>Can you print the pv from your engine, so I can get some indication of where
>>mine is going wrong.
>
>After 47...Re3 48. Kf2 Kd2 49. Kf1 (for example), it is clear, that any other
>black move will be a check by the R. The white K is restricted to 9 squares -
>the rectanggle f1-f3-h3-h1. It is clear, that the first repetition will be
>before the K reached all those nine squares, because any second move will be to
>the 2nd row. So, in the 7th move from now, it will be a repetion. For example
>
>49...Re1+ 50. Kg2 Re2+ 51. Kh3 Re3+ 52. Kh2 Re2+ 53. Kg3 Re3+ 54. Kf2
>Re2+ 55. Kf3 Re3+ 56. Kg2 {1st repetition)
>
>Regards,
>Dieter
>
>PS. Another one, much longer, whery Yace got trapped by Tinker:
>
>[D] 7k/6R1/6R1/1r5P/6K1/8/8/8 b - - 0 55
Dieter
Thanks for the suggestions. In fact I tried all those things. No hash, no
extentions and no (hash + no extensions).
After 1 hour 15 mins (of normal engine configuration) I have Re3+ and +0.65.
I do not doubt that the position is a perpetual, but I was hoping to see the
0.00 line by an engine that finds it.
Here is a similar one I cannot get either. It have come from CCC, but I cannot
remember.
[D} 7k/4QP2/7p/6rP/8/1K6/6r1/8 b - -
Frank
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