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Why must the evaluation function not be applied mid exchange?

  • A.The opponent's reply cannot be predicted in such positions
  • B.The material count is momentarily misleading
  • C.The evaluation function runs too slowly in complex positions
  • D.The position may be a terminal one requiring exact scoring

Answer: B

A position in which a queen has just been captured looks winning until the recapture is considered, so evaluating there systematically misjudges by a wide margin. Quiescence search resolves the exchange first. Speed, terminal detection and prediction are separate concerns. An estimator that is accurate on average but badly wrong on an identifiable subset of cases should be prevented from being applied to that subset, which is exactly what quiescence does.

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