Author: Jeff GAZET
Date: 03:01:05 04/23/04
Go up one level in this thread
>>Good morning, >>i'm trying to add extensions to my engine. I'm using a classical alphabeta >>function : >>int alphabeta(int depth, int alpha, int beta) >>depth is dicreased 1 by 1 : >>eval=-alphabeta(depth-1,-beta,-alpha); >> >>At the beginning at the function alphabeta(), if king is incheck, i do >>++depth. This works fine. >> >>In the main move loop, if do a ++depth on a promoting move, juste before >>calling -alphabeta... the engine searches for ever when the first promoting >>move is found. Then, if i add "if depth<1" or <2, i don't see any >>improvment. >Maybe a stupid question, but you do remember to do depth-- after your call to >alphabeta(..)? Otherwise you could be extending *every* move in positions where >a promotion is available. Yes, depth is dicreased each call to alphabeta : eval=-alphabeta(depth-1,-beta,-alpha); >>I don't understand how engines like GnuChess can write : depth+=DEPTH when >>extending. >>(DEPTH is 12). >> >>Could someone give me some explanations, please ? >> >>Regards. > >Andrew
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