Author: Paulo Soares
Date: 22:33:46 07/20/99
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On July 21, 1999 at 00:56:56, Christophe Theron wrote: (snip) > >Some programs don't see the mate in 2 (with both pawns on the 7th rank) because >after 1. Ra6! black is in zugzwang. > >Looks like nobody has read my previous post and I'm just losing my time trying >to explain it... > >Both Hiarcs and Fritz would fail on some zugzwang positions. Not on this one, >which is solved by Hiarcs, but there are positions where Hiarcs fails completely >because of its null move algorithm. > >...OK, just losing my time... :) > > > Christophe Christophe, this question was made by Eric Guttemberg, and was without reply. Could you answer, I have the same doubts of Eric. "With regard to the zugzwang problem, I am a little confused. I know that many basic endgames techniques rely repeatedly on the zugzwang theme. In many of them the weaker side would never lose if he could waive his move when it suited him(mating with K and R vs K is a whole different ballgame if the weaker side can not be forced to move) Yet Fritz does not seem to have any trouble with any of the basic endgame positions. What kinds of zugzwang positions does Fritz and other null-movers have trouble with?" Paulo Soares, from Brazil
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