Computer Chess Club Archives




Subject: Side-to-move bonus in static eval.

Author: David Blackman

Date: 01:30:31 12/05/99

Go up one level in this thread

>I have never been asymmetric, unless you count a small bonus for the side to


A bonus for side to move has the advantage that it should reduce the node count
if you don't do null-move pruning. But it gets more complicated if you do
null-move pruning. Some tests i did a long time ago suggest it might actually
increase the node count.

One trick is to do the bonus for side to move, but also give a bonus every time
you do a null move. That cuts the node count, but might cause loss of positional
understanding. Also can cause obscure bugs. I'm not sure i ever debugged it

Has anyone else looked at this bonus with the intent of reducing the size of the
tree search?

Of course in Peter's case i think he uses the side to move bonus just because he
wants good positional understanding. In most chess positions, being the side to
move is a plus factor, so it should be included in the eval if you want to get
it right.

This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.