Author: Pallav Nawani
Date: 12:51:09 08/04/04
Go up one level in this thread
On August 04, 2004 at 15:23:58, Tord Romstad wrote:
>On August 04, 2004 at 14:39:39, Gopikrishna wrote:
>
>>I am doing depth reduction.
>>
>>if (nextdepth > 2)
>>{
>> if (!Iscapture && !Ispromotion)
>> {
>> score= eval();
>> if (alpha > score + red_margin[nextdepth])
>> nextdepth--;
>> }
>>}
>>
>>So should I have to do full evaluation or just evaluate the material score and
>>pawn structure alone? Because if I do full evaluation for each move it would
>>take plenty of time? Thanks.
>
>I have to disagree with Pallav here.
>
>Reducing the depth based on nothing more than the evaluation is extremely
>risky, and if you don't even do a full eval you can definitely not afford
>it. Your program will be fast, but it will miss a terrible lot of important
>moves and lines (positionally as well as tactically). If you really want
>to do something similar to the above code, you need a rather complicated
>static eval which is called at all internal nodes. You will also need
>many more conditions in addition to !Iscapture and !Ispromotion.
>
>It is not impossible to make something like this work well, but it is
>rather difficult, and should almost certainly be postponed until you
>have a stable and reasonably strong program.
>
>Tord
With a big enough margin it ain't so bad, and besides, it helps a bit when
searching deeper. But yes, it is probably best postponed until you're sure you
have a bug free program.
Pallav
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