Beta

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Beta (β) is the upper bound of a score for the node. If the node value exceeds or equals beta, it means that the opponent will avoid this node, since his guaranteed score ( Alpha of the parent node) is already greater. Thus, Beta is the best-score the opponent (min-player) could archive so far - in a Negamax framework from max-players point of view, where beta is the negated value of alpha from the parent node. If a beta-cutoff occurs on the upper bound of a Cut-Node given by Beta, the value returned is a lower bound.