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
Dark chess classical variant, any 2-player chess variant may be played "in dark". SchemingMind provides some of the variations. Dark chess has a strong strategic flavor. Planning and strategy, as well as some psychological reasoning, are very important; tactics and move searching are not as important as in standard chess. In this variant, a king should be carefully protected from very dangerous checks by invisible pieces. For a queen the most dangerous pieces are knights, which can attack it without becoming visible. Dark chess Dark chess is a chess variant with incomplete information, similar to Kriegspiel. It was invented by Jens Bæk