Author: Paulo Soares
Date: 15:00:05 02/02/00
Go up one level in this thread
On February 02, 2000 at 17:49:52, José de Jesús García Ruvalcaba wrote: >On February 02, 2000 at 17:41:35, Paulo Soares wrote: > >>On February 02, 2000 at 17:35:55, José de Jesús García Ruvalcaba wrote: >> >>>On February 02, 2000 at 15:34:32, Georg Langrath wrote: >>> >>>>On February 02, 2000 at 13:04:57, Rob Shultz wrote: >>>> >>>>>I ran the following position on Fritz 5.32 and even after 40 minutes it did not >>>>>see the win! I was using a PII 450. Junior 5.0 saw the win right away. Is >>>>>there some setting I could have changed to cause Fritz to miss this? >>>>> >>>>>[D]3n4/8/pppN4/k7/2P5/1K6/P7/8 w - - >>>>> >>>>>The win follows c5. >>>>> >>>>>Thanks, >>>>>Rob >>>> >>>>It is a bug. As it is a mate in 3 it should be found instantly. Neither newest >>>>Fritz 6, nor mate search program in Fritz find it. I have also tried earlier >>>>versions of Fritz with the same bad result. >>>> >>>>Georg >>> >>> This looks like a classic null-move problem to me: 1. c5 b5 2. a3 and black >>>is in zugzwang, if black is allowed to pass at this point it is not a mate in >>>three. >>>José. >> >>Yes, if you put selectivity=0, Fritz5.32 found the mate. >> >>Paulo Soares, from Brazil > > Does selectivity=0 disable null-move in Fritz? It seems that the new Fritz 6a >has some sort of zugzwang detection. > >José, from México. Yes, selectivity=0 disable null-move in Fritz. Fritz6(or 6A) have no problems with this position, but I don't know the reason. Regards from Brazil to Mexico, Paulo
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