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What is late move reduction?

  • A.Searching moves ordered late to a shallower depth
  • B.Reducing the number of moves considered near the end of the game
  • C.Shortening the search as the time control approaches
  • D.Reducing the depth of the search in the late middlegame

Answer: A

If the move ordering is good, moves tried late are unlikely to be best, so searching them shallowly and re-searching only if they look promising saves a great deal. It is another forward pruning technique whose soundness depends on the ordering being reliable. Endgame move counts, clock management and game phase are different notions. A technique whose safety depends on another component working well creates a coupling that must be remembered when either is changed.

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