Author: Robert Hyatt
Date: 16:59:26 07/19/02
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On July 19, 2002 at 13:45:07, Uri Blass wrote: >On July 19, 2002 at 13:16:06, Joshua Lee wrote: > >>I was wondering that if the DB team estimated a rating or over 300 points higher >>than the programs at that time on equivalent hardware or equal search, they >>weren't clear on that. That would mean 2796 on a P200 and Fritz 7 for example >>wouldn't be anywhere near this on a P200. Has anyone seen anything about their >>tests against commercial software and does anyone have any opinions about this? >> >>Granted that Software has improved and that on Todays Fastest Hardware The Top >>Programs (provided the SSDF list is that accurate) is on equal footing with Deep >>Thought and DB Jr. > > >Why do you think that they may be only equal. >I believe that the opinion of most programmers is that >the top programs of today are clearly better >than Deep thought and deep blue JR. > >It is known that their search algorithms were bad >relative to what is known today >(otherwise you could see people who copy their >search algorithms with good results when I know that >the people who tried to copy the way that they use >singular extensions got bad results in games so >they do not use it). > >It is known that they believed some wrong assumptions > >They believed that null move pruning is dangerous at >their speed when the results say that null move pruning >is only more productive when the machines are faster. > >They believed that the brute force depth is not very important >at their speed and singular extensions are more important >and they were again wrong(programs already >have similiar speed to deep thought and they do not use >singular extensions in the way that deep thought used them). > >Their speed simply misleaded them to wrong assumptions >that they did not test. > >Uri That last sentence is simply wrong. On two counts... 1. They tested _and_ wrote several papers on their search extensions. It was hardly "not tested". 2. I have said this before. You can accomplish the _same_ thing with either selective extensions, or selective forward pruning. There need be _no_ difference in the two... Assuming there is is theoretically incorrect.
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