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What is the horizon effect?

  • A.The inability to evaluate positions near the end of the game
  • B.The loss of accuracy as the evaluation function is applied deeper
  • C.The limit on how many plies a program can search in the time available
  • D.Pushing an unavoidable loss beyond the search depth

Answer: D

A program may play a series of pointless checks or sacrifices that delay a loss until after the last ply it examines, so the loss disappears from its view and the position looks acceptable. Extending the search selectively in forcing lines is the standard remedy. Endgame evaluation, accuracy decay and time limits are separate matters. A failure caused by stopping the search at a fixed depth, rather than by any error in the evaluation, points at changing where the search stops.

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