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Castling is a move in chess.It consists of moving the king two squares toward a rook on the same rank and then moving the rook to the square that the king passed over. [2] ...
The rook (/ r ʊ k /; ♖, ♜) is a piece in the game of chess. It may move any number of squares horizontally or vertically without jumping, and it may capture an enemy piece on its path; it may participate in castling. Each player starts the game with two rooks, one in each corner on their side of the board.
In standard chess, if a move is found during the game, the position immediately before the irregularity is reinstated. [68] In the most used form of rapid chess and blitz chess if the move is found before the opponent moves, the position immediately before the irregularity is also reinstated. [71] [f]
A rook can move any number of squares along a rank or file. A rook is involved in the king's castling move. A bishop can move any number of squares diagonally. A queen combines the power of a rook and bishop and can move any number of squares along a rank, file, or diagonal.
If it gets to one of the squares marked with "x", the king can move next to the pawn and the rook can capture the pawn for a draw. Otherwise, the king needs to stay on the squares marked with dots: g7 and h7. The reason is that if the black king is on another rank, the white rook can check and then the pawn promotes and wins.
In addition, as the pawn advances, the space the rook can move to attack it continues to shrink, while the range of the white rook increases. Thus, a rook is better-placed behind one's own pawn. In the case on the g-file, roles are reversed: White's rook is behind Black's pawn while Black's rook is in front.
In the diagram, both black rooks could legally move to f8, so the move of the d8-rook to f8 is disambiguated as Rdf8. For the white rooks on the a-file which could both move to a3, it is necessary to provide the rank of the moving piece, i.e., R1a3.
In chess, a back-rank checkmate (also known as a corridor mate) is a checkmate delivered by a rook or queen along the opponent's back rank (that is, the row closest to them) in which the mated king is unable to move up the board because the king is blocked by friendly pieces (usually pawns) on the second rank.