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Subject: null move and draw detection

Author: scott farrell

Date: 04:45:37 12/11/02


What does the detection of a draw during a Null Move Search mean? Can you
cut-off based on the score being a DRAWSCORE that comes back from the nullsearch
if it is >=BETA?

I think the meaning is undetermined, and is a probably related to ZUGS.

I just changed my code, such that if a draw it detected during a nullmove, I
return ILLEGAL straight away.

I guess it depends on the type of draw detected:

StaleMate - this is the clear ZUG
Repitition - maybe I should even really be checking for draw by rep during null
move search
NM - not enough material.

What do other people do in their engines?

Ideas much appreciated
Scott



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