Author: Tony Werten
Date: 04:47:59 09/01/02
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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 > >Best regards, >Bas.
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