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A pawn can be promoted to a queen, a knight, a rook or a bishop. My question is why would someone want their pawn to be promoted to anything other than a queen? I can understand the knight promotion since their unconventional movement can lead to a sophisticated check mate, but other than that why would anyone promote their pawn to a rook or a bishop, since a queen can be both?
Are there any known occurrences where a player has promoted his/her pawn not to a queen?