Author: Robert Hyatt
Date: 21:26:03 12/27/99
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On December 27, 1999 at 23:12:11, leonid wrote: >On December 27, 1999 at 23:00:55, Tom Kerrigan wrote: > >>On December 27, 1999 at 21:43:54, leonid wrote: >> >>>Hello! >>> >>>When the extensions were used in PC chess games for the first time? >>> >>>If you could indicate me some very strong and recent chess game that did not >>>used the "extensions", it could be real help. I tryed for a long time to figure >>>out what the raw speed of my logic is but "extensions" kept me in the dark. >>>Maybe I even have those useful "oldies" that can solve my mystery. Just name >>>them! >>> >>>Thanks, >>>Leonid. >> >>The check extension has been used since the beginning of time. >>-Tom > >I had the impression that somebody mention them as "invention of IBM". Maybe is >was my mistake. One sad mistake. > >Leonid. The "check extension" goes back to the early 1970's at least. In fact, the GreenBlatt program used it (albiet somewhat differently than at present). Chess 3.x and 4.x used them. As did everyone else in the middle 70's. I doubt you could find a program that didn't use them, unless the program was just in the beginning stages of development..
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