Computer Chess Club Archives




Subject: Question: Fail High then Low at Root

Author: William Bryant

Date: 22:38:49 12/27/99

I looked at this a year ago, but want to again ask the best way to handle
this situation.

You fail high at the root,
	increase alpha to beta -1
	increase beta to Mate (or Mate - 1 depending upon how these are defined)
Then you fail low on the same move.

What I have been doing is accepting the fail high as correct,
	making this the PV move,
	and continuing the search at the next iteration with
	a window set around alpha which is the old beta -1, + or - the aspiration
	window size.

Is this correct, is there a better way to handle a fail high/low.



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