Author: Uri Blass
Date: 03:30:54 01/07/03
Go up one level in this thread
On January 07, 2003 at 06:20:15, Ed Schröder wrote: >On January 07, 2003 at 06:00:58, Uri Blass wrote: > >>On January 07, 2003 at 05:47:37, Ed Schröder wrote: >> >>>On January 07, 2003 at 05:05:31, Tony Werten wrote: >>> >>>>Hi Ed, >>>> >>>>your board tables seem to ignore xray attacks. >>> >>>xray attacks are done, it's only not mentioned as I thought it would be >>>self-understood. >>> >>> >>>>Is that because it doesn't matter too much, or because it's mainly used for move >>>>ordering ( so it's only less effective but not wrong ) ? >>> >>>I use xray also for evaluation, for instance for mobilty, king safety, so xray >>>must be done and in an accurate way, I will write a little about it in the >>>mobility section. >>> >>>Ed > > >>Hi Ed, >> >>I have 2 questions about the evaluation. >> >>1)Did you try to do incremental evaluation. > >I have tried it in the past, it was maddening, if you are in love with bugs, >self-torture and headaches then doing incremental evaluation is the right path >to go. > > >>I think that incremental evaluation may be faster than doing the full evaluation >>at every node until depth-1. > >It is faster of course, but don't hold your breath, you will have to restore >things too when climbimg back in the tree (decremental evaluation), meaning >things have to be done twice. On "incremental evaluation", you can of course put >all things on stack and just copy things back but that is also costly. > > >>The problem is that doing it without bugs is not easy espacially when you have a >>big evaluation. > >Yes, that's why I never finished the job, the second reason: it wasn't that much >faster. > > >>2)Did you check that your full evaluation is really productive if you assume the >>same number of nodes. >>I remember that when I tested personalities of Rebel I found that knowledge=500 >>changes it's mind more often so it needs more nodes to finish the same >>iteration. > >Natuarally [Chess Knowledge = 500] beats [Chess Knowledge = 100] slightly based >on fixed depth, but it loses with a big margin using a normal time control, >remember the gain from Lazy Eval is over a factor of 3. > >Ed I know it but the interesting question is based on fixed number of nodes because my impression was that chess knowledge=500 needs more nodes to finish the same depth. Uri
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