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Why do opening books and endgame tables both improve play?

  • A.They replace an estimate with knowledge where knowledge exists
  • B.They allow the program to search more deeply in the middlegame
  • C.They reduce the memory the program requires during play
  • D.They make the evaluation function unnecessary in those phases

Answer: A

In both phases the search would otherwise rely on a heuristic estimate, and substituting prepared or exact values removes that error entirely. The middlegame, where no such resource exists, is where search and evaluation must do the work. Memory rises rather than falls, and the evaluation is simply not consulted there. Using exact knowledge wherever it is affordable, and estimating only where it is not, is the division of labour every mature system arrives at.

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