Author: Dave Gomboc
Date: 09:48:08 05/20/99
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On May 20, 1999 at 06:01:29, Ed Schröder wrote: >>Posted by Dave Gomboc on May 20, 1999 at 03:00:12: > >>>Extensions (remaining): A number of the list of "Extensions on depth" >>>is also tried in the tree. Here I use fractional increments of 1/4 ply. One >>>idea is to push the hash table entries of best lines. In other words, if >>>the current move is from the hash table and the move of the previous >>>ply too then the depth is increased with 1/4 ply. Also some promotion >>>extensions are tried which increment may vary on their importance. >> >>"Pushing the hash table" sounds interesting. I have never heard of this being >>done before! >> >>In "Search Control Methods in Deep Blue", a small (I think 1/4 ply) extension >>was done if a move by the opponent was made possible by the last move of the >>opponent (i.e. they are following some plan... and might be putting together >>some kind of combination, even if you're not sure what it is yet). They >>referred to this as "influence", I think. I do not remember if they >>invented it or if it was cited from somewhere else. > >I am not sure if I understand you correctly. Say Nf3-e1 as an example, then >extend new possible moves like Nd3, Nf2 and so on with 1/4 ply. Correct >interpretation? Not a bad idea. If Nf3-e1 was played on the last iteration, then Nd3 would get a small extension, yes. Was Nf2 a typo? Oh, I see. In positions where Ne1-d3 was played, yes, Nd3-f2 would get a small extension too. That's right. I am thinking they invented this, I haven't heard about it before either. >Ed Schroder Dave
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