Author: José Carlos
Date: 10:50:42 11/26/01
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On November 26, 2001 at 10:51:25, Uri Blass wrote: >On November 26, 2001 at 10:45:44, Michael Borgstaedt (GOLIATH CHESS) wrote: > >>On November 26, 2001 at 10:19:17, Steve Maughan wrote: >> >>>Michael, >>> >>>>Less than 5% of the evaluation in Goliath (Light 1.5) is done by "piece-table >>>>evaluation". Besides, nearly no prescanning is done. The latest version (which >>>>won the blitz tournament during the WM/Maastricht) comes without any type of >>>>prescanning or piece-table evaluation. Little/Light Goliath uses much (!) more >>>>chess knowledge than many users would expect. But Goliath is still extremely >>>>fast and the only "secret" is the way, how I realized the cooperation between >>>>search and knowledge. This has nothing to do with "lazy evaluation". Goliath >>>>uses a special "oracle" which decides, how much and what type of knowledge will >>>>be used for the reached leaf position. And, of course, the essential parts of >>>>the program (search, make/unmake move and so on) are highly optimized for >>>>speed. >>> >>>I stand corrected!! >>> >>>Impressive speed indeed if you are doing mostly leaf node evaluation. A couple >>>of questions: are you defining nodes as all legal move calls to AlphaBeta and >>>QSearch? >> >>Yes, the usual way. > >I think that the usual way is considering illegal moves also as nodes. > >I know that Crafty generates illegal moves as nodes except cases when the king >is in check and Crafty generates only legal moves. > >Does Goliath consider illegal moves that puts the king under threat as nodes and >if the reply is positive in which cases? > >Uri I don't think it's the usual way to count illegal moves. I do nodes++ at the end of makemove, only when I know the move is legal and return(TRUE). I believe most people don't count illegal moves. José C.
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