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What is a transposition table?

  • A.A record of the moves played so far in the current game
  • B.A table converting between two representations of a position
  • C.A store of positions already evaluated, indexed by position
  • D.A table of the legal moves available in each position

Answer: C

Because different move orders reach the same position, storing its computed value avoids searching it again, often saving a large fraction of the tree. It is the graph search explored set applied to games, usually with a hash of the position as the key. Move generation, game records and representation conversion are different structures. Recognising a general technique reappearing in a specialised setting is what allows its known properties and pitfalls to be carried across.

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