Computer Chess Club Archives




Subject: Re: High NPS vs. Low NPS

Author: Uri Blass

Date: 07:51:25 11/26/01

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On November 26, 2001 at 10:45:44, Michael Borgstaedt (GOLIATH CHESS) wrote:

>On November 26, 2001 at 10:19:17, Steve Maughan wrote:
>>>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
>>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
>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?


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