Author: chandler yergin
Date: 03:53:19 12/02/05
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On December 02, 2005 at 03:29:45, Martin Giepmans wrote: >On December 02, 2005 at 03:16:35, Martin Giepmans wrote: > >>Of course only Fabien can know, but a possible explanation is that Fruit uses >>extensions that depend on game history, for example a recapture extension for >>recaptures on ply 1. >>When you enter the game there is a recapture (e5xf6) on ply 1 but when you enter >>the position there is none. This results in a different search tree. >> >>Martin > > >There is already a difference at depth 6, more extensions (i.e. higher max. >depth; I assume that the number after 6/ is the maximum depth?) and more nodes >when the game is entered. >This could be caused by history dependent extensions such as a recapture >extension on ply 1. > > >position entered: >1.Qxc3 Qxc3 2.bxc3 fxe5 3.Rd1 hxg4 4.Kc2 > = (-0.17) Depth: 6/16 00:00:00 21kN > >game entered: >34.Qxc3 Qxc3 35.bxc3 fxe5 36.Rd1 hxg4 37.Kc2 > = (-0.17) Depth: 6/18 00:00:00 22kN > > > >Now I'm curious what Fabien will say .. :) > >Martin I think you nailed it. "Of course only Fabien can know, but a possible explanation is that Fruit uses extensions that depend on game history, for example a recapture extension for recaptures on ply 1. When you enter the game there is a recapture (e5xf6) on ply 1 but when you enter the position there is none. This results in a different search tree." Of course games history has everything to do with it. Hash is kept as the position is evaluated 1/2 move = 1 Ply at a time.
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