Promotion is a chess term used to describe a pawn that changes rank to a queen, bishop, knight, or rook after the pawn has reached the the other player's side. The player can choose from any of the above pieces, but may not choose another pawn or a king. Usually, the queen is chosen, but in some positions, another piece is required to avoid stalemate. The knight is also chosen often, as its movement cannot be replicated by the queen (or any other piece, for that matter). Promotion is sometimes referred to as "queening" when the pawn becomes a queen. Some chess sets come with an extra queen for each color. If not, it is usually represented by an inverted rook.
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