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What is a ply in game tree terminology?

  • A.One move by one player
  • B.A complete move by both players in turn
  • C.The depth at which the evaluation function is applied
  • D.A branch of the game tree from root to leaf

Answer: A

A ply is a single player's move, so what a chess player calls a move is two plies, and search depths are always quoted in plies to avoid the ambiguity. Full moves, cutoff depth and complete lines are different notions. Precision here matters because a program searching ten plies is looking five moves ahead in the everyday sense, and confusing the two doubles or halves every estimate of a program's strength.

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