Author: Marc Bourzutschky
Date: 08:35:00 08/29/05
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On August 29, 2005 at 10:45:38, Duncan Roberts wrote: >On August 29, 2005 at 03:29:12, Marc Bourzutschky wrote: > >>...snip >Great achievement. well done. > > >how long would a dtm program have taken to solve the 6-man krnknn endgame on >your machine. ? > We don't have a DTM version, so I don't know. In this particular case, probably not that much longer. The real benefit of DTZ is in endings such as kbbknn, where the bishops may capture to a very long kbbkn ending, artificially creating very long lines for kbbknn. In DTZ all you care is whether the subgame is won or not. In pawn endings the benfit is even more dramatic. >have you ever tested the elo increase in strength for a complete 6 man endgame ? > No. I don't believe 6 and even 7-man tablebases will improve playing strength significantly. First of all, few games ever get that far into the ending before being decided, and secondly it is very difficult to have an ending avoid wasting time probing in positions it could handle perfectly well on its own. My own work right now is purely focused on the "search for truth" rather than improving computer playing strength. >how many computer months roughly do you reckon it would take all the pawnless 7 >man database to complete as well as the whole 7 man database. and how many >positions are there ? > It would take several computer years, but I'm not even thinking about starting such a project. The vast majority of endings would be of no interest. Our next focus is probably on endings such as kqppkqp, krppkrp, kbppknp, perhaps only considering promotions to queen to avoid having to generate massive amounts of strange tablebases. >is there any computer knowledge you can extract from these tests that could be >put in an evaluate for those particular positions. I'm sure there is, but extracting such knowledge even from 5 or 6 man endings has not really been done successfully so far. > > >thank you > >duncan -Marc
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