Author: Torstein Hall
Date: 08:35:07 09/30/99
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On September 29, 1999 at 20:49:23, Bruce Moreland wrote: >On September 29, 1999 at 19:54:01, Dann Corbit wrote: > >>For NULL move, we have two kinds of situations: >> >>0. A move is so bad I wish I did not have to make it because I would rather >>skip a turn. >> >>1. An opponent's move is so bad they would not want to make it because they >>would rather skip a turn. >> >>In the first case, it seems we do not need to consider this move unless there >>are no alternatives. >> >>In the second case, similarly unless the *opponent* has no alternatives. >> >>What I am wondering is "why is the loss of a tempo the magic dividing line?" >> >>It seems the dividing line could be put anywhere we want. Has anyone >>experimented with a floating [don't bother looking here] line that can be >>redefined during run time? I know this sounds a lot like ordinary alpha/beta >>but what I mean is to change the threshold for null-move to something other than >>the normal value. > >I haven't tried to deal with the first part of this, but I can handle your >question a paragraph from the end. > >The reason you skip a move is in order to determine if the opponent has a >threat. If their is bad and they don't even have a threat you have to counter, >you are probably doing great. > >bruce Just a probably stupid question to satisfy my curiosity! Do you have to extend after the null move? Lets say the oponent can take a Bishop with a Queen, but that would loose the Queen next move etc. etc.? If you not extend, would that not keep reasonable moves down "on the list" and keep you from seeing a lot of good moves? Torstein
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