Author: Uri Blass
Date: 10:49:47 11/21/02
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On November 21, 2002 at 11:18:27, Richard Pijl wrote: >On November 21, 2002 at 11:07:39, Daniel Clausen wrote: > >>On November 21, 2002 at 11:04:55, Robert Hyatt wrote: >> >>>On November 21, 2002 at 08:34:36, Uri Blass wrote: >>> >>>>1)I do not find in the pseudo code in figure 3 undo null move. >>>> >>>>I assume that it should be before if value>=beta and after value=-search(...) >>>>Am I right? >>> >>>Remember that a null move is not a move. So it is possible that there is >>>nothing to undo. I update the hash signature to avoid a different problem, >>>so I have to undo that as you suggest... >> >>Well, since side-to-move is part of the hash signature, I hope that everyone is >>updating something at that point. Or did I miss something? >> >Not if you have separate hashtables for wtm and btm. >But there are other things ... dealing with ep flags, fifty moves rule etc. >Richard. You also always have to update the side to move after undoing null move(otherwise you may think that it is white to move when it is black to move) so there is clearly something to undo. Uri
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