Author: Robert Hyatt
Date: 07:10:13 03/10/01
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On March 10, 2001 at 02:18:25, Uri Blass wrote: >On March 09, 2001 at 21:41:28, Robert Hyatt wrote: > >>On March 09, 2001 at 16:59:41, Thorsten Czub wrote: >> >>>one major things chessbase invented that is that good that others >>>HAVE to copy it. >>> >>>thanks to chessbase. thanks to ed and christophe. >> >> >>I would hardly say ChessBase invented the idea. Ken Thompson used this >>idea to order his ply-1 move list years ago. I've seen this approach used >>in the old ACM annotation contests also... > >I believe that Chessbase was the first company to do it commercial. > >Uri That hardly qualifies as "invented it" in my book. I copied the idea from someone else (I don't remember who) and used it in Cray Blitz for debugging. I had what I called a "true value" search where you could specify "tv N" where N was a number, and for each iteration you would get the PV/score for the best N moves. It was ridiculously inefficient to do this of course, since alpha/beta won't supply such a value for every move. But it helped for debugging, immensely. I explained how I did this many years ago on r.g.c.c when Ingo Althofer was suggesting that someone might try to do this. Several had, just not in programs that were publicly available...
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