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In queenside castling, the king is placed closer to the center and does not defend the pawn on the a-file; for these reasons, the king is often subsequently moved to the b-file. In addition, queenside castling is initially obstructed by more pieces than kingside castling, thus taking longer to set up than kingside castling.
In chess, the Dragon Variation [1] is one of the main lines of the Sicilian Defence and begins with the moves: . 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6. In the Dragon, Black's bishop is fianchettoed on g7, castling on the king's side while aiming the bishop at the center and queenside.
A wild game with unsafe kings is sure to ensue. 6...h6 is a safer declination of the sacrifice, forcing the bishop to trade with 7.Bxe7 Qxe7 after which White may continue to try to attack on the kingside in anticipation of Black castling kingside (since queenside castling is undesirable due to the need for c5) with 8.f4 a6 9.g4 with a menacing ...
Castling: The notation O-O is used for castling kingside and O-O-O for castling queenside. The word " Castles " is sometimes used instead, particularly in older literature, in which case it may be necessary to disambiguate between kingside and queenside castling; this may be done by specifying the rook or side, i.e. " Castles KR ," " Castles Q ...
SAN kingside castling is indicated by the sequence O-O; queenside castling is indicated by the sequence O-O-O (note that these are capital Os, not zeroes, contrary to the FIDE standard for notation). [4] Pawn promotions are notated by appending = to the destination square, followed by the piece the pawn is promoted to. For example: e8=Q.
Castling is indicated by the special notations 0-0 for kingside castling and 0-0-0 for queenside castling. A move that places the opponent's king in check usually has the notation "+" suffixed. Checkmate can be indicated by suffixing "#". At the end of the game, "1–0" means White won, "0–1" means Black won, and "½–½" indicates a draw. [2]
The notation in the rest of this section refers to the version with the colors reversed. Character: Semi-open game. Themes for White: d6 weakness, c4–c5 push, a3–f8 diagonal, queenside pawn storm. Themes for Black: d4 weakness, a1–h8 diagonal, f4-square, kingside attack, trading pieces for a superior endgame.
Castling with the h-file rook is known as castling kingside or short castling (denoted 0-0 in algebraic notation), while castling with the a-file rook is known as castling queenside or long castling (denoted 0-0-0).