Author: Dave Gomboc
Date: 11:52:30 12/30/02
Go up one level in this thread
On December 30, 2002 at 05:53:16, Martin Giepmans wrote: >On December 30, 2002 at 05:30:45, Ed Schröder wrote: > >>As it seems I have completely mishandled explaining Reduction 2b and 2c, I have >>corrected things. >> >>http://members.home.nl/matador/chess840.htm >> >>Click on the blue "update" picture, it will move you directly to the changes >>made. That will be standard procedure from now on in case of errors. >> >>if (remaining_depth<=x && remaining_depth>1) then >> { if (ALPHA < SCORE + THREAT) -> do not reduce >> if (ALPHA < SCORE + THREAT + MARGIN) -> reduce depth with one ply. } >> >> SCORE : score of EVAL >> THREAT : Queen=900, Rook=500, Bishop=300, Knight=300, Pawn=100 >> MARGIN : TABLE [remaining_depth]; >> >> static int TABLE[]= { 00,00,10,15,20,25,25,25,25,25,25,25,25,25, >> 25,25,25,25,25,25,25 ........... }; >> >>The idea is, if SCORE+THREAD are not going to make it to ALPHA, but with an >>extra small MARGIN it will then reduce the depth. I can't remember the speed-up >>this reduction gave. >> >>==== >> >>Ed >> >>PS, the "faulty stuff" plus Uri's correction is maybe worth a try, who knows :) > >The < in the second formula should be > ? >Otherwise the two formula's together don't make sense. >(if the first is true, the second is also true) > >Martin I think it's: if ((remaining_depth <= x) && (remaining_depth > 1)) then { if (ALPHA < SCORE + THREAT) -> do not reduce *else* if (ALPHA < SCORE + THREAT + MARGIN) -> reduce depth by one ply. } Dave
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