Author: Charles Roberson
Date: 11:16:20 02/18/06
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On February 18, 2006 at 13:30:09, Jouni Uski wrote: >The book "Schach am PC" from 1995 says, that alfa-beta reduces evaluated >positions with 5 * sqrt (positions). Also some example values are given >like: > > positions alfa-beta positions >8 ply 6.5e12 13e6 >9 ply 2.6e14 80e6 > >Are these values outdated? Has there been significant improvements later? I >think today's engines get x plys with much smaller nodes. > >Jouni Most books that refer to alpha-beta improvements in node counts view it from the perspective of only alpha-beta is applied to minimax. Thus this does not consider null-move, move ordering heuristics, reductions, extensions, or ........ Yes, todays engines do better but because they do more than just alpha-beta. Charles
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