Author: Richard Pijl
Date: 06:29:19 01/10/03
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On January 10, 2003 at 05:28:42, Uri Blass wrote: >On January 10, 2003 at 05:17:53, Frank Phillips wrote: > >>On January 09, 2003 at 21:36:57, Dieter Buerssner wrote: >> >>>On January 09, 2003 at 13:30:37, Frank Phillips wrote: >>> >>> >>>>[...] In which case has anyone got any good position for testing >>>>repetition detection. >>> >>> >>>From SOS-Yace IPCCC, 2001 >>> >>>[D] 8/p1rR4/4P3/5pp1/2kp4/P3PK2/8/8 b - - 1 44 >>> >>>I think it is a draw here. But difficult to find. After 44...Rc6 45. e7 Re6 46. >>>exd4 Kd3 47. d5 it is much easier. >>> >>>[D] 8/p2RP3/4r3/3P1pp1/8/P2k1K2/8/8 b - - 0 47 >>> >>>The various positions in between might be interesting to test. >>> >>>Regards, >>>Dieter >> >> >>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..... >> >>Is this a draw by three fold repetition? (There are quite a few pawn moves.). >> >>Frank > >It is a simple perpetual check after Re3+ and Kf2. >I have no problem to see it and the same for my engine. > >Uri Well, I can see it, but the Baron can't. Neither can Crafty 19.0 by the way. On a PII-500 and more than 9 minutes, Crafty gets a fail high on ply 16, but eventually resolves it in 22 minutes, returning the score 2.27 (from the perspective of white) and not a sign of the perpetual check variant in the PV. Richard.
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