Author: Chris Whittington
Date: 01:15:24 11/14/97
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On November 14, 1997 at 03:30:27, Andreas Mader wrote: >Chris has claimed many times that his CSTal only searches 4000 NPS and >performed very well in Paris, whereas the 'fast searchers' (>100 >KiloNPS) had their problems. > >This is of course true, but it leads to a question: How do you count the >NPS? I don't know if this has been asked before, but I would like to >know, how different programs are counting NPS. Can it be that Chris is >simply the 'king of understatement' because he uses a different >algorithm? I'm pretty sure I count in the standard way; here my method, Bob or whoever can say if its standard or not ..... CSTal tree searches, like everybody else. At each node it does the following: makemove evaluate if (extend_this_node) { do a hash lookup - it might find a mtach and cutoff here go one more deeper, recursively and return back to here } unmakemove if score>alpha etc the above process count for ONE node. if the hash finds a cutoff it still counts for ONE node if the node gets extended then we add more nodes by the same process >If you find a position in the hash tables, do you count it? yes, as one node, as described above >If a position has a 'clear' material balance so that you do not need to >do some 'fine tuning' in the evaluation function, do you count it? CSTal doesn't do a lazy eval, since the eval function can produce very large scoring swings. Only MATERIALISTS do lazy evals :) So not applicaple. >When you do quiescence search, do you count the NPSs? CSTal doesn't work to this MATERIALISTIC algorithm. Any node, extension or whatever you want to call it gets counted. >etc. etc. > >Could it be that the 'real' factor between knowledge based programs and >fast searchers is not that big (4000 : 200.000)? Don;t think so, but comments welcome .... Chris > >Best wishes >Andreas
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