The Rook, along with the Queen, is one of the major pieces. Because it starts the game in the corner, it usually plays a role only when the middle game has been reached. That doesn't mean it should be ignored in the opening.
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Relative Value of Chess Pieces :
Rook exchanges
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The Rook
'Owing to the original position of this piece, which is blocked up by its own men, and the nature of its movements, it cannot be made much use of in the early part of the game.'
('Relative Value of Pieces and Principles of Play' by Wilhelm Steinitz)
[Image: Mark of Westminster,
www.ChessUSA.com,
used with permission]