In the event that one player moves a pawn to the other side of the board, the pawn is "promoted" to any piece that player wants. It does not have to be a piece that has already been captured. This means that a player can get a second Queen if the original queen has not been taken. Since the original queen is still on the board it cannot be used as the second queen. If that player has lost a rook, that rook is turned upside down and put on the board to represent the second queen.
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Yes,
any piece can take any other piece.
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Actually - a King cant take a King because to get within one square the king would be putting himself in "check"
When the opposing queen is vulnerable, it can be taken by any defender (pawn, rook, knight, bishop, etc)
Yes, in chess this move is possible just as long nothing is protecting (infront,side) of the black rook.