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What is the first move of the principal variation?

  • A.The move that produced the largest number of pruning cutoffs
  • B.The move the program plays
  • C.The move the opponent is predicted to reply with immediately
  • D.The move that was best at the previous shallower search depth

Answer: B

The principal variation begins with the move minimax selected, so its first element is the program's choice and the rest is its expectation of what follows. The previous iteration's best move is used for ordering rather than played, and cutoff counts belong to the killer heuristic. Being able to read a program's output correctly is a small skill that makes its behaviour comprehensible rather than mysterious.

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