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Transposition (chess)

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A transposition in chess is a position on the board that can be reached by the same piece in more than one way. A simple example: White can move its knight from g1 to g5 by following either sequence of moves (in algebraic notation): 1.Nf3 2. Ng5 or 1.Nh3 2.Ng5.

Transposition tables are an essential part of a computer chess program.

 


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