Chess Rules Rook

The rook, shaped like a castle, is one of the more powerful pieces on the board. The rooks, grouped with the queen, are often thought of as the "major pieces". Rooks are worth a bishop or a knight plus two pawns.

The rook can move any number of squares in a straight line along any column or row. They can't move diagonally. The simplicity of the rook's movement is indeed what makes it powerful. It can cover a significant area of the board and there are no areas which an opponent's piece, moving one square at a time, can slip through.  The rook also has a special ability to make a move called 'castling'.