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As in classical chess, each player may castle once per game, moving both the king and a rook in a single move; however, the castling rules were reinterpreted in Chess960 to support the different possible initial positions of king and rook. After castling, the final positions of king and rook are the same as in classical chess, namely:
Castling is the only move in chess in which two pieces are moved at once. [3] Castling with the king's rook is called kingside castling, and castling with the queen's rook is called queenside castling. In both algebraic and descriptive notations, castling kingside is written as 0-0 and castling queenside as 0-0-0.
The idea is to eventually counterattack on the g1–a7 diagonal with a move like ...Qb6, preventing White from castling. [23] An example line would be 6...g6 7.Nf3 Bg7 8.a4 Nc6 (note 8...Nc6 as opposed to the usual Najdorf ...Nbd7, as c6 is a more flexible square for the knight with a queen on b6) 9.Bd3 Qb6.
The rules can be grouped into categories, from the most innocuous (starting position) to the most dramatic (adding chance/randomness to the gameplay after the initial piece placement). If a variant changes rules from multiple categories, it belongs to the sub-section below corresponding to the later-listed category.
Castling consists of moving the king two squares towards a rook, then placing the rook on the other side of the king, adjacent to it. Castling is only permissible if all of the following conditions hold: [11] The king and rook involved in castling must not have previously moved; There must be no pieces between the king and the rook;
According to Jim Bickford, [1] one of the characteristics of this defense is the "cork-screw" maneuver the knight makes by traveling to the second rank via f6 and h5. In the introduction to his monograph, Bickford quotes the late Tony Miles as saying "The black knights are better on the second rank – a shame it takes two moves for them to get there."
The rook cannot jump over pieces. The rook may capture an enemy piece by moving to the square on which the enemy piece stands, removing it from play. The rook also participates with the king in a special move called castling, wherein it is transferred to the square crossed by the king after the king is shifted two squares toward the rook.
The rules of chess prescribe the moves each type of chess piece can make. During play, the players take turns moving their own chess pieces. The rook may move any number of squares vertically or horizontally without jumping. It also takes part, along with the king, in castling. The bishop may move any number of squares diagonally without ...