Author: Frank Phillips
Date: 10:13:27 01/10/03
Go up one level in this thread
On January 10, 2003 at 12:54:02, Frank Phillips wrote:
>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
Dieter
Spoke too soon... seems to be a null move issue. Interesting; and thanks.
Frank
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