An optimization of alpha-beta search
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Most computer programs that play games like chess choose moves by searching a lookahead tree of possible continuations. After this search computes the minimax values of the root's subtrees, the subtree with maximum value is chosen as the program's move. The alpha-beta algorithm speeds up this search by pruning irrelevant branches from the tree. In this note we present a slight modification of the alpha-beta algorithm that can further reduce the size of the root's last subtree. We assume that the reader is familiar with the negamax version of the alpha-beta algorithm as presented in [i]:
[1] Donald E. Knuth,et al. The Solution for the Branching Factor of the Alpha-Beta Pruning Algorithm , 1981, ICALP.