Author: Ernst A. Heinz
Date: 02:07:06 01/29/99
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On January 28, 1999 at 17:28:49, Peter Fendrich wrote: > >The idea isn't that new! >Chess 4.5 used what you are describing as early as 1974! >They never called it razoring or anything else from what I know. >Source: "Chess skill in man and machine", Peter W. Frey, 1977. Dear Peter, Thank you very much for pointing us to Slate & Atkin again -- I have to admit that I completely forgot about this short passage in their article which actually starts on page 107 in the 2nd edition of Frey's classic book. There, Slate & Atkin introduce a limited form of normal futility pruning at frontier nodes with a remaining depth of 1 ply (called "n-1" by them). They do no depth reduction but really cut all quiet moves if the position is futile with respect to "material balance + maximal positional score <= alpha". In contrast to Jonathan's normal futility pruning they do not prune any captures. =Ernst=
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