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Subject: Crafty QSearch Question

Author: William Bryant

Date: 19:04:23 02/16/99


Dr. Hyatt,

	Following you discussion of checks in the Qsearch in rgcc, I reviewed
Quiesce() in the crafty source.  You calculate a delta value as follows:
	the delta = alpha - 8/10 of a pawn - the difference in material

Do I understand correctly that, if the value of captured piece is not at least
as great as this delta value, the there is no point is searching this capture
and no point in adding it to the qsearch move list?

Also, do you sort the captures by the least valuable attacker / most valuable
piece with the idea that pawn capturing a queen will most likely generate a
cutoff meaning that you can skip the rook captures knight move?

Thank you.

William Bryant
wbryant@ix.netcom.com






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