Author: Georg Langrath
Date: 22:46:28 02/02/00
Go up one level in this thread
On February 02, 2000 at 18:00:05, Paulo Soares wrote: >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 When I tried Fritz 6 has the problem in analyze or mate mode, but not in time mode. Georg
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