Three special cases

your queen's rook, depending on which side you wish to castle. You tlien move the relevant rook to the square through which the king has just passed. (The diagrams on page 66 illustrate the various options.) Castling is extremely important, representing the symbolic entry of the king into his fortress.

It is wise to castle early in all your games. There are two important advantages. Castling is a vital means of moving a rook quickly to the center, where it can be most useful; and it takes the king immediately away from the center, where it is vulnerable.

Depending on whether the king's rook or the queen's rook is used, we speak of castling kingside or queenside (see diagrams). Castling is the only move in which two of your own pieces can move simultaneously. You may castle only if the king and the rook involved have not made previous moves and remain on their starting positions; and also only if the squares between the king and the rook have been vacated and are unoccupied, There are two additional conditions:

1. The king may not castle if it is in check, nor may it castle into check.

2. Castling is prohibited if the square through which the king passes (i.e., the square on which the rook finishes) is under attack from an enemy unit.

Note that it is possible to castle if the rook is threatened. Queenside castling is also permitted even if square bl (or, in Black's case, b8) is under fire.

In chess notation, kingside castling for both White and Black is written as 0-0. Queenside castling is given as 0-0-0. The finer points of chess etiquette dictate that in castling you move the king first.

Before Write castles kingside

After White castles kingside

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Before Black castles queenside After Black castles queenside mv, m m^'m w/^'m w£ m m., ém.

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