Author: Bas Hamstra
Date: 05:17:37 09/01/02
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On September 01, 2002 at 07:47:59, Tony Werten wrote: >On September 01, 2002 at 06:29:16, Bas Hamstra wrote: > >>>Now suppose FP is right but we don't prune. What happens ? We go to quiescence; >>>evaluate; get a score above beta; and cutoff. So no nodes saved. >>> >>>FP can only save nodes when we would otherwise spend time in quiescence; ie >>>score is not above beta ie fp was wrong. >>> >>>People who report big wins with fp probably have an "inc(nodecounter)" in the >>>top of quiescence, wich doesn't get called when pruning. >> >>Couldn't agree more. Those nodecounts are very misleading, what counts is depth. >>And once you measure that, it suddenly isn't so great anymore. Heinz bases his >>research on nodecounts. But the nodes saved are "cheap" nodes, that are >>_accurately_ cut by lazy eval with little cost anyway. FP is good for picking op >>wood in blitz, not much more. >> >>But regarding SEE, not doing it MUST mean a fairly higher qrate, no? It slows >>you down and gets somewhat better in tactics. Only I hardly see that tactical >>advantage, really. Of course it might depend on your qsearch. Mine is typically >>2-3 x bigger than a Crafty like miniqsearch, not doing SEE would make it even >>worse. > >It's a choice. From games XiniX played I always had the feeling it should >improve in tactics. The positional evaluation was quite exact but it happened >too often: I have a good position, I have a good position, I have a good >position, oops that costs a knight. > >Now my first few ply in Qsearch are very simular to a normal search. > >Tony Interesting. I tried that also, and it found good things sometimes. I threw it out because it slowed me down too much. But I still think it's interesting, especially if you find a way to throw out quiet nonsense moves. You must have a hell of a qrate now, or not? As compared to a Crafty like qsearch, what is your qrate? Mine is about a factor 2,5 and yours? Must be even worse? Best regards, Bas.
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