Discussion
What is the risk of a narrow beam width?
Answer: D
Pruning to a fixed width may discard the only node leading to the goal, and once discarded it is never reconsidered, so the search can fail on a problem that has a solution. Widening the beam trades memory for reliability, and stochastic variants keep some diversity. Memory falls rather than rises, admissibility is a property of the heuristic, and termination is unaffected. An approximation whose failure mode is silent deserves particular care in deployment.
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