The most important thing is that all four players playing use the same rules at the same time. It is assumed that clocks will be used. In the event that they are not, you must make up rules in regard to stalling. Pieces are set up on two boards next to each other with one player white and a partner next to him as black. Starting piece placement is the same as in regular chess.
All pieces move in the same manner as in chess.
The goal of the game is to checkmate one of the two opponents, or to take his king. When you take an opponent's piece, you pass it to your partner. He then may insert that piece onto his board in place of a move. Pieces may be placed on the board on any open square including the first and last ranks. Pieces may be placed with check or checkmate.