Author: Ernst A. Heinz
Date: 00:14:03 08/03/98
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On August 03, 1998 at 02:21:12, Amir Ban wrote: > >I always accept the fail-high move immediately. > >There are parameters that you are important that you don't mention: What size >window is used during normal search ? If it's zero-width, or very small, then >fail-high doesn't mean it's much better than the previous best, and you can take >the new move or leave it. If you use a 0.3-0.5 window, as I do, fail-high means >it's clearly better than the previous, even it later fails low. > >Also, what window do you use on the re-search that fails low ? If you use >new-alpha+1 to infinity, then maybe the fail-low happened because the value is >exactly new-alpha. If you use a window of old-alpha to infinity, then a >fail-low >indeed makes the move suspicious. > >Amir Good point, Amir! Actually, I do not recall to having encountered the fail-low after fail-high behaviour as long as the research is done with the *old alpha*, i.e. the same that was used when the fail-high occured. Otherwise, this nasty fail-low after fail-high behaviour unfortunately seems to occur quite frequently. =Ernst=
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