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If you are talking about algebraic notation. Getting the piece and the destination square is trivial. The origin is more interesting to produce: have a list of pieces (and their position) currently on the board; if there is no disambiguation#Disambiguating_moves), check which of the two can legally move to the target square. How you implement the piece list is also interesting: you can start in a naive manner, but also use a bitboard, like in the decodeSan function in chesslib.
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