Author: Tim Foden
Date: 23:29:40 04/21/02
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On April 21, 2002 at 19:29:39, Will Singleton wrote: >All, > >[D]5nk1/2R3p1/r4p2/4P3/p2R2N1/7P/1r4P1/7K b - - 0 42 > >The question is, my prog wants to play a3, and doesn't see the forced repetition >until ply 9. I've just thrown away my old buggy rep code, and replaced it with >a dedicated hash table. The new stuff seems to be debugged and working (maybe), >but there must be a trick to getting this position earlier. An extension, >perhaps? Green Light sees this at 5 ply. The line it gives is: 42... a3 43. Nxf6+ gxf6 44. Rg4+ Kh8 45. Rh4+ Kg8 46. Rg4+ The only extension used here is a check extension x 4, which gets it to the required 9 ply. The other trick, of course, is that GL considers it a draw if the position occurs twice in the current search. > >Will
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