Author: Uri Blass
Date: 04:00:38 09/29/01
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On September 29, 2001 at 05:37:39, Georg v. Zimmermann wrote: > >>>As Christophe already explained, this isn't a matter of extensions (those >>>_are_ nearly always limited to prevent explosions like this) but of >>>a quiescent search going mad. >> >>This is a question of definition >>you can look at quiescent search as extensions. > >Nope. > >Extensions extend a full width search, meaning after a check I extend on I look >at *all* continuations maybe one ply deeper. >Quiesce is limited to very few move types like captures and promotions for some. 1)You assume that everyone is using brute force. I remember that I read that your assumption is not correct at least for Rebel. 2)Saying that moves that you search are not extensions only because you use some kind of selective search does not convince me. The natural definition for brute force depth of x plies is that you search only lines of x plies and you never look at line of x+1 plies. searching more than x plies is simply extension by the logical defintion because it means that you search more than x plies. I agree that you have 2 kinds of extensions(extensions when the remaining depth is 0 and you do selective search and extensions when the remaining depth is more than 0 when programs usually do brute force extensions) > >Georg > >By the way, fixing your program to find a mate fast in these positions is silly >since they will not happen in real games. The fact that they will not happen in real games does not mean that fixing the program to find them is silly. I do not think that limiting the qsearch is silly. These case may not happen in real games but I can imagine that cases when the program waste too much time on the qsearch can happen(it may be only 0.01 seconds for one qsearch but if you add all these times then it may be a problem) Uri
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