Author: Dave Gomboc
Date: 14:05:22 03/25/99
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On March 25, 1999 at 06:25:51, blass uri wrote: > >On March 25, 1999 at 06:02:56, Dave Gomboc wrote: > >>On March 25, 1999 at 00:19:38, blass uri wrote: >> >>[snip] >> >>>Here are some wrong assumptions that explain errors for my Fritz5(16 bit): >>> >>>assumption 1:KRP vs KR cannot be a win for the weaker side.(There is no problem >>>of this assumption for KQP vs KQ) >>>assumption 2:KQ vs KRP cannot be a win for the weaker side. >>>assumption 3:KQX vs KQ when X is not a pawn is a draw unless X is a rook. >>>assumption 4:KQR vs KQ cannot be a win for the weaker side. >>> >>>Uri >> >>Regarding KQP vs KQ: >> >>White: Kh6, Qc7, Ph7 >>Black: Kg4, Qa6 (to play) >I guess that you mean Qb5 and the tablebases show the mate. > >>1...Qg5# would win for the "weaker" side. Sorry, yes, was a mistake. As you point out, black Q on b5 works. As far as I know, the tables that Fritz is using only indicate "win for stronger side" or "not win for stronger side"... which is being interpreted as "draw". So if there is a position that was theoretically drawn, Fritz might play the queen to a6, thinking that the position is still drawn. I guess what you were saying was that such a position (where white is not winning and can blunder into a loss) does not exist in KQP vs KQ? I am not 100% sure of this, but maybe. :-) >>If they only probe the tablebases at the root of the tree, I can imagine your >>suggestion of doing a short search before and after working. If they probe >>within the search like Crafty does, the overhead might be too significant. > >They only probe at the root > >Uri Okay. Dave Gomboc
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