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What is retrograde analysis?

  • A.Searching backwards from the goal in a single player puzzle
  • B.Reconstructing the moves that led to a given position
  • C.Computing endgame values backwards from terminal positions
  • D.Analysing a game after it has been played to find errors

Answer: C

Starting from positions whose value is known by rule and working backwards, one ply at a time, gives exact values for every position with few enough pieces, and the resulting endgame tablebases are used by every strong chess program. Post game analysis, backward search and move reconstruction are different activities. Computing exactly where exact computation is feasible, and estimating elsewhere, is a division of labour that appears throughout applied search.

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