Castling Castling Castling is a move in the game of chess involving a player's king and either of the player's original rooks. It is the only move in chess in which a player moves two pieces in the same move, and it is the only move aside from the knight's move where a piece can be said to "jump over" another. Castling consists of moving the king two squares towards a rook on the player's first , then moving the rook to the square over which the king crossed. Castling may only be done if the king has never moved, the
First-move advantage in chess additional pieces. Fischer advocated Fischerandom Chess, another chess variant, in which the initial position of the pieces is determined at random. Today some of the opening variations have been analyzed so deeply that they are often used as . For example, at the highest levels, Black often uses the Marshall Attack in the Ruy Lopez, a line where Black sacrifices a pawn for strong attacking chances, to obtain an endgame where Black is still a pawn down but is able to draw with correct play. In 2007, GMs Kiril Georgiev and Atanas Kolev asserted that much the same was true