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==Draw Scores==
===Zero===
Assuming symmetric [[Evaluation|evaluation]] and [[Negamax|negamaxed]] values, positive scores indicate the [[Side to move|side to move]] is ahead, and negative if behind, which defines the value of zero as a natural [[Draw|draw]] score, no matter whether the draw is caused by a [[Stalemate|stalemate]], [[Repetitions|three-fold repetitions]], [[Fifty-move Rule|fifty-move rule draw]], or [[Draw evaluationEvaluation#immediate|draws]] by [[Material#InsufficientMaterial|insufficient material]].
* [[Fifty-move Rule]]
* [[Repetitions]]
which is about 115 pawn units, or about 11,500 in centipawn units. Practically it is quite safe to saturate the heuristic eval value range with +-30 to +-50 pawn units, which leaves enough space for disjoint scores for [[Interior Node Recognizer|interior node recognizers]]. Some programs exclude zero as heuristic score, to make heuristic values absolutely disjoint from perfect terminal node scores, which has some issues considering contempt.
* [[Draw evaluationEvaluation]]
* [[Evaluation]]
* [[Mop-up evaluation]]
