Author: Uri Blass
Date: 12:38:58 02/16/04
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On February 16, 2004 at 14:43:48, Robert Hyatt wrote: >On February 16, 2004 at 10:31:03, Steven Edwards wrote: > >>Symbolic: The TNS (Thousand Node Search) >> >>The idea of limiting the cognitive search in Symbolic to under a thousand nodes >>is based upon psychological studies that suggest top level human chessplayers >>usually visualize between 100 and 1,000 positions per move in complex >>middlegames. My personal time control upper limit preference for non-blitz >>chess is a minute per move, and so the resulting target figure for node >>frequency is about 20 Hz. > >I think you are starting off here using an unsound assumption. > >"100 to 1000 positions per move" is probably nowhere near right. There is a >difference between a human mentally moving pieces around, and his comparing them >to pattern-recognition information that in itself is the result of searching >significant amounts of tree space. > >Who knows _what_ I actually do after thinking a few minutes and moving the >pieces around in my head, to decide 'this position is one I want to reach." Did >my "static evaluation" fold in a bunch of past experiences via pattern matching? > IMHO picking some number like 1K is just picking a number like 1K, not that 1K >is more or less meaningful than 100 or 10K... > > >trying to quantify how many "positions" a human searches is pointless until we >know how a human really "searches". To date, we have no idea. this probably >won't change for many years, until all the marvelous abilities of the human >brain have been analyzed and understood. I think that it is not necessary to know how the human brain analyze and it may be possible to generate something better because humans do not do something that is close to optimal. Humans do a lot of mistakes and they use a lot lazy evaluation. When humans visualize positions they do not count exactly pawn structure of every position and other factors and their lazy evaluation may miss an important positional factor that they could see by looking at the relevant position for another second. Humans also do not have a perfect memory and they may analyze the same line again because they forgot that they already analyzed it or they forgot the result of their analysis. Uri
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