Transcendental Chess of one side can be any of 4²×6!÷2² = 2880. There is no castling. On the first turn a player, instead of making a move, can transpose any of two pieces on the back row. In Chess960 the back rows are mirror images, but in Transcendental Chess the setup of black and white is different 2879 out of every 2880 times (there being a 1–in–2880 chance that both sides will draw the same setup). This can create inequalities in the position. One way to equalize these inequalities is to play a couplet: the players play two games, one each as
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