In the beginning of the game takes every player a piece (but not the king) from the board. Later he can as a own move exchange this piece with another piece. The piece which can be changed get there place in ower implementation on the golden fields on the right side. You can change as often you like.
 
The name of the game is a conglomoration of the german words `Tausch` and `Schach`. We could translate this name to exchanchess.