Author: milix
Date: 10:41:20 01/23/05
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On January 23, 2005 at 11:37:51, rasjid chan wrote: Hi Alvaro and Rasjid! Why search potentially better deeper? I think extensions apply in those situations where the value of a line is not reliable enough to be trusted - like a line full of checks or recaptures for example. There are some moves that are very bad and we need to search really deep to see that they are bad. As for the initial question i think that some kind of extensions is beneficial to enable/disable them if we are near or far from the leaves. Why to extend a push of a passer in the 7th when you are planning to do a 20ply search from there? >On January 23, 2005 at 06:09:23, Alvaro Jose Povoa Cardoso wrote: > >>Hi everyone, >>an issue that has been on my mind for quite some time is that if extensions >>should be done everywhere in the tree or at the nodes immediately before >>qsearch. >>Take for example the pawn push to 7th (2nd) rank extension. >>If we are near at the root (say ply2, ply3, ply4, ...) why extend if we are sure >>the search will reach and past well beyond the promotion? >>Woudn't it make more sense to make this (and other extensions) at nodes >>immediately before qsearch ? >>Same thing for check extensions, one reply extension, recapture extension, etc. >> >>Best regards, >>Alvaro Cardoso > >Why not view all extentions this way. > >We have different lines of play (moves) and we extend lines that seem to have a >better chance to be good(PV), ie the likely better moves are searched deeper >RELATIVE to the average moves. So the question of your concern may be >irrelevant. At the next iterration at root, your good lines will again be >searched N depth deeper... repeatedly. This may correct way to view depth >extention. > >Rasjid
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