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
Promotion (chess) Promotion (chess) Promotion is a chess rule that requires a pawn that reaches its eighth to be immediately replaced by the player's choice of a queen, knight, rook, or bishop of the same . The new piece replaces the pawn, as part of the same move. The choice of new piece is not limited to pieces previously , thus promotion can result in a player owning, for example, two or more queens despite starting the game with one. Pawn promotion, or the threat of it, often decides the result in an endgame. Since the queen is the most powerful piece,