Author: Georg Langrath
Date: 13:05:44 02/03/00
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On February 03, 2000 at 11:24:34, Paulo Soares wrote: >On February 03, 2000 at 01:46:28, Georg Langrath wrote: > >>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 > >Strange, my Fritz6(updated) solves the problem in mate mode. In Analyze >mode(infinite analisys), the problem isn't solved. >Paulo Soares, from Brazil Try to wait a while. It first seems to solve it in mate mode, but then abandon the solution. Georg
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