Author: John Merlino
Date: 12:43:40 08/16/02
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On August 16, 2002 at 07:55:05, Slater Wold wrote: >On August 16, 2002 at 07:00:40, Chuck wrote: > >>I can no longer find the exact text, but as I recall the author of Hiarcs 8 >>claimed the search algorithm was greatly improved to avoid the "explosion" of >>the search tree at great depths. This appears to me to be a false claim. >> >>I run alot of deep analysis with Junior 7, Fritz 7, Chess Tiger 14, Gambit Tiger >>2, Shredder 6, Rebel Century 4, Gandalf 5 and Hiarcs 8. Often I let a program >>analyze a single position for 2-4 days. All seem to handle this well except >>Hiarcs, which is completely incapable. It seems there is a certain point where >>the nps dramatically drops on Hiarcs. All the computers I use are 1.2 - 1.5 GHz >>with 256-512 MB RAM, and Hiarcs will usually report 150-200 kn/s, but after a >>day or more this figure will drop dramatically. Right now I'm looking at another >>computer where it has been analyzing a position for 45:19:56 and it is reporting >>23 kn/s! I've seen it drop further, to 10-15 kn/s where I kill it. This may >>always happen (haven't really tracked it, normally I just give up on Hiarcs >>after it wastes so much of my time). I used to and would like to still be a >>Hiarcs fan, but this is a significant problem IMO. >> >>It seems to me the tree "explosion" is still a big, big problem and the author's >>claim was false. My evidence suggests Hiarcs is crippled at deep analysis. > >That's not what's happening......... > >What is happening, is that the node counter has to restart. So when it >calculates nps, it is way off. All engines have to restart their node count >after X amount of searching (depending if they are 32 or 64 bit). Yes, this happens in Chessmaster (32-bit counter, which isn't too bad since The King is relatively low on the NPS ladder). But, since we don't have an NPS display, it isn't a big deal (it just looks funny if you let analysis run for many hours and the counter wraps). jm
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