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What is quiescence search?

  • A.Extending the search until the position is no longer volatile
  • B.Searching quietly without printing intermediate results
  • C.Reducing the search depth in positions that appear settled
  • D.Evaluating only those positions in which no piece is under attack

Answer: A

Applying the evaluation function in the middle of an exchange gives nonsense, so the search continues along captures and checks until a stable position is reached and only then evaluates. It costs extra nodes and removes a whole class of blunder. Reduced depth in quiet positions is a different technique, and refusing to evaluate unstable positions without searching them would leave nothing to return. Ensuring that an estimate is applied only where it is valid is a principle that extends well beyond games.

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