Author: Matthias Gemuh
Date: 09:45:49 07/02/03
Go up one level in this thread
On July 02, 2003 at 11:39:18, Vladimir Medvedev wrote: >It is written on Ed's page: > >"Whenever REBEL gets a fail-low or fail-high at the root position (we are back >at ply one), REBEL doesn't immediately opens the entire alpha or beta window, >instead of that it tries a new window of 2.00 and only then when REBEL is faced >again with a fail it opens the complete (corresponding) window. The 2.00 window >will do for most of the positions when a fail occurs, that's the tought behind. >" > >Why does he expand window only in the root node? >Won't this technique work in inner nodes as well? What is the critical >difference between position at ply=0 and ply=1,2,3 ? At root, he must have an exact score (alpha < score < beta) to have a move. In tree, he prefers a cut-off (score > beta) and no move needed. /Matthias.
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