Author: Peter Fendrich
Date: 02:28:05 01/29/99
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On January 29, 1999 at 05:07:06, Ernst A. Heinz wrote: >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= I rememberd it because I borrowed the idea to my own program after having read about it in that book, 1978-79 or so. That book in general and that article especially, became some sort of "bible" to me within the chess computer programming area at that time! //Peter
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