Author: Ed Schröder
Date: 04:21:38 01/07/03
Go up one level in this thread
On January 07, 2003 at 06:30:54, Uri Blass wrote: >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. I think this is true, more QS nodes looks only natural when Lazy Eval is excluded. Ed >Uri
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