Author: David Blackman
Date: 01:30:31 12/05/99
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>I have never been asymmetric, unless you count a small bonus for the side to >move. > >cheers, >Peter 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 properly. 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.
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