Computer Chess Club Archives




Subject: Re: About SEE

Author: Robert Hyatt

Date: 06:55:43 01/05/01

Go up one level in this thread

On January 05, 2001 at 03:38:48, Severi Salminen wrote:

>>>So this is like doing a more accurate futility pruning in qsearch. Do you use
>>>the same margin as in futility pruning (I use 2 pawns). If I have understood
>>>right, futility pruning in normal search does only need to know the value of
>>>piece being captured, not the true swapoff value so SEE doesn't help there.
>>I think I use one pawn.  But my original "estimate" is not really just the
>>material score, it is a true call to Evaluate() since this has to be done to
>>fill in the "stand pat" score anyway.  It is very unlikely a single capture
>>will change the material score in a huge way except when the last piece is
>You mean the positional score?

Yes.  Brain-dead at times. :)

>>removed, etc...  and you can factor that in..
>>You can use just the value of the piece being captured for futility pruning,
>>but it is more accurate to use the SEE score instead, as it is a better
>>estimate of what will happen...
>Yes, of course now that I think of it: if the score after only the first capture
>as <=alpha then it must definitely be lower using the see score and with see
>you'll get much more moves pruned.


This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.