Author: Ernst A. Heinz
Date: 10:59:26 01/25/00
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Hi Eugene, >Maybe problem was because Crafty doesn't generate checks in the Q-search? No, checks in the quiescence search have nothing to do with the principle of normal futility pruning. "DarkThought" does not do checks in the quiescence either. I really suspect that Bob did actually not perform normal futility pruning at frontier nodes but some kind of razoring instead. This indeed does not seem to work very well according to the combined practical experiences of several people (mine included). =Ernst= P.S. Among other things, my new book "Scalable Search in Computer Chess" handles the topic of futility pruning and its various flavours in a concise way. The book is now available at Amazon.de and MKP online. http://www.amazon.de/exec/obidos/ASIN/3528057327/ http://www.mkp.com/books_catalog/3-52805-732-7.asp Please visit http://supertech.lcs.mit.edu/~heinz/node1.html for more information about the book.
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