Author: Ed Schröder
Date: 02:30:45 12/30/02
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 :)
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