When a capture is made, both pieces and all pieces on adjacent squares are removed from play.
When a capture is made, both pieces and all non-pawn pieces on adjacent squares are removed from play.
When a capture is made, the square becomes a Dead Square. All pieces on adjacent squares are removed from play. No piece can move on or through a Dead Square.
When a capture is made, both pieces and all pieces on adjacent squares are removed from play. Selecting a another game mode will result in slightly different behavior.
All other chess rules apply, with the following simplifications:
There is no en passent capturing.
When a pawn reaches the last rank he becomes a queen.
Castling is allowed if the king and the rook are on their start position and there are no pieces between them.