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Subject: Help: Null move and Aspiration failure

Author: William Bryant

Date: 05:34:20 05/15/99


OK, 1st big problem which is probably something I don't understand.

The program fails low at the root resetting alpha to -INFINITY.

You now make your first root move, and search with alpha now equal to -beta,
and beta equal to -alpha, which makes beta equal to INFINITY.
If you call a null move at this point, the null move window is
INFINITY, INFINITY +1 which obviously does nothing but return a score of
INFINITY which is greater or equal to beta .....


What am I doing wrong.  Do you screen for this before doing a null move?

William
wbryant@ix.netcom.com



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