Computer Chess Club Archives




Subject: Question about evaluation and branch factor

Author: Marcus Prewarski

Date: 09:28:57 11/20/03

I've been completely rewriting the evaluation function of my engine
DrunkenMaster (not a strong one) because I was tired of seeing it make some
really ugly moves and I want to give it better knowledge of king safety and pins
and better passed pawn evals.  When I watch it play 5 minute games against an
earlier version it seems like the evaulation is better overall.  However it
seems like these evaluation changes have made the branch factor a bit worse in
several test postions I have.  And it performs worse in WAC test suites which
seems to agree with my observations.  I would think that improving my evaluation
function would improve the search branch factor if anything.  So my question is
does this mean that my newer evaluation function is actually worse in most cases
than my old one or could it be something else like my move ordering is bad to
begin with?


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