Author: Eugene Nalimov
Date: 09:55:41 01/29/99
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On January 29, 1999 at 05:28:05, Peter Fendrich wrote: >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 There was an excellent book in Russian :-) "Games programming", written by Kaissa authors. That idea was presented there as well - I first time read about it there. Book was published in the end of 1970s, if I remember it correctly (have not brought it with me to the US). Eugene
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