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=Heuristic Nodes=
Other [[Leaf Node|leaf nodes]] than terminal nodes determine a heuristic value of the [[Chess Position|position]] by an [[Evaluation Function|evaluation function]]. The value range of heuristic values has a symmetrical reduced value range far outside the mate scores, dominated by the [[Material|material balance]], with the theoretical maximum of
<pre>
9*VALUE_QUEEN + 2*VALUE_ROOK + 2*VALUE_BISHOP + 2*VALUE_KNIGHT
