Author: Inmann Werner
Date: 13:23:46 03/30/00
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On March 30, 2000 at 16:14:12, Peter Fendrich wrote: >On March 30, 2000 at 15:47:03, Inmann Werner wrote: > >>On March 30, 2000 at 15:39:09, Peter Fendrich wrote: >> >>>On March 30, 2000 at 15:04:09, Inmann Werner wrote: >>> >>>>On March 30, 2000 at 11:07:16, Robert Hyatt wrote: >>>> >>>> >>>>>Here is mine: >>>>> >>>>>1. hash table move. >>>>>2. captures that don't appear to lose material using a SEE procdedure, >>>>>ordered from biggest gain to equal exchanges. >>>>>3. 2 killer moves. >>>>>4. up to 4 history ordered moves (history heuristic) >>>>>5. rest of the moves. >>>> >>>>question to 5) >>>>here is the rest of the non capturing moves and the "loosing capture" moves. >>>>Which of them should be searched first? >>>> >>>>IMHO the non capturing moves. >>>> >>>>Werner >>> >>>I don't think you should order them at all... >>>When the program reaches this point it will probably not find a fail high for >>>the current node and the sorting will only cost performance without giving much >>>in return. >>>//Peter >> >>Excuse, but I do not agree. >>Why should a good positional move not produce a fail high? > >Of course it could, but even a capture given a bad value from SEE can turn out >to be a fail high. It's all about cost vs return of the effort, I think. For me >it is not worth the effort (in case 5 above) to pick moves in an ordered manner. > Now I can agree :-) It is a matter of cost vs return. For me, the cost is Null, the return only little. In my tests, it is overall a little better, to try the positional moves before, but as said, only a little... >>And i do not sort. I only give the moves "values" at generation time. In search, >>I only look at the first 9 moves in an ordered way, the rest i pick at random. > >I do the same but only with the 3 first moves ordered. > Only 3!!! I will try, but it seems "brutal" (is this also english) So much work for move ordering, and then only use 3 moves ... :-) Werner
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