Discussion
Does alpha beta pruning change the value returned by minimax?
Answer: C
Alpha beta prunes only branches proved irrelevant, so the value and the chosen move are identical to those a full minimax search would return. It changes only the effort. That distinguishes it sharply from forward pruning techniques, which discard branches on suspicion and do change the result. A technique that is free in the sense of costing nothing in quality deserves to be used always, which is exactly the status alpha beta has.
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