Author: Robert Hyatt
Date: 05:51:20 08/06/99
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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...
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