Author: Bob Durrett
Date: 08:02:05 02/03/04
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On February 03, 2004 at 08:09:52, William Penn wrote: >On February 03, 2004 at 04:32:35, Matthias Gemuh wrote: > >> >> >>Zied Haddad seems to be unable to connect to CCC from Tunesia. >>He seeks to know whether others have encountered a Shredder 8 problem he has: >> >>after playing many games in a row without clearing hash tables, Shredder 8 >>starts messing and missing even mate in 1, till hash tables are cleared. >> >>[http://f50.parsimony.net/forum200321/messages/5855.htm] >> >>/Matthias >>(message posted on Zied's request) > >You may be right. I'm not sure yet, but I will start clearing the hash tables >before each analysis and see if it makes a difference. Note that I only run >Shredder 8 in infinite analysis mode for a long time to analyze positions. <snip> > >WP (1) I read somewhere that it's always a good idea to clear the hashtables before starting a new analysis but do not recall the reason. Nevertheless, I now always hit that "clear hashtable" button whenever I see it. (2) The PV for Shredder is total garbage except for the first move and this is a known bug in Shredder, acknowledged by it's author. It hopefully will be fixed one of these days. The sooner the better. (3) With some engines, I notice another bug which may or may not be related to this one. While doing user-guided infinite analysis, sometimes the nps number drops to a tenth of it's normal value. When that happens I cuss a little and then save the position, turn off the engine, and then restart it, clearing the hashtable. Then the nps goes back to a reasonable value. I do not recall which engine does this, but it has to be either Crafty, Shredder, Fritz, Hiarcs, Tiger, or Junior since those are the engines I use as CB8 analysis engines and for overnight automated game analyses. (4) I still have not learned how to use Chessmaster for analysis, perhaps because I'm getting overly senile. It's a pity that The King is not available as a CB8 analysis engine because if it were I would use it often. Bob D.
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