Author: Ed Schröder
Date: 03:01:29 05/20/99
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>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. Ed Schroder
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