Author: Pete R.
Date: 08:27:26 08/06/99
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On August 06, 1999 at 08:51:20, Robert Hyatt wrote: >On August 06, 1999 at 00:33:02, Terry Ripple wrote: > >> I sometimes see accesses from a total of 7 to 9 pieces still on the board and >>was wondering how accurate it`s analysis of the evaluation is and is the >>analysis more accurate when it shows alot more accesses like several thousand >>compared to 10 to 100 accesses or don`t this matter, as long as it`s showing >>that it reached the endgame tablebases? Please note that i only installed the >>four man tablebases in my Hiarcs7.32! >> I`am using a AMD K6-2/266Mhz with 64 RAM and when playing games other than >>blitz,i set the hashtables to 44.032KB. >> >>Thankyou in advance for any information, >>Regards,Terry > > >Think about it like this. At that stage of the game, your engine is probably >searching at least 15 plies deep. For simplicity, think of the tree as a >graph that is _exactly_ 15 plies deep along every line. With tablebase probes >in the search, after any capture that takes the total pieces down to 4 or >less, that branch goes no deeper and gets an _exact_ score at that point. > >However, your numbers are way off from what I see. I typically see the first >EGTB hits (crafty, using 3-4-5 piece files) with 14-15 pieces still on the >board (at blitz-type time controls). Hiarcs might be more conservative on how >deep it can probe than Crafty is, I am not sure. But it makes a significant >difference in the right positions... I just bought Hiarcs 7.32 the other day. The GUI is the same as Fritz, the big difference is the tablebase access, and the really cool thing is that Crafty can access the tablebases now within the GUI as well. I tested both Hiarcs and Crafty on a position with about 8 or 9 pieces, and while they both hit the tablebases I noticed that Crafty did so *much* more than Hiarcs, almost by a factor of 10 as I recall.
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