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src: wikipedia
- Definition
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- castle :a large and stately mansion
- castle :move the king two squares toward a rook and in the same move the rook to the square next past the king
- castle :a large building formerly occupied by a ruler and fortified against attack
- castle :(chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard
- castle :interchanging the positions of the king and a rook