Board 12 x 12 board, the pieces are set up in the central 8 x 8 area as per FIDE chess.
All pieces have momentum.
A piece that moves, continues to move in that direction at that speed until one of three things happens. If the piece's momentum carries it off the board edge, it is removed from play. If a piece's momentum carries it into another piece, it stops. If a player's move results in the capture of a piece, the piece moved does not have momentum after the capture. Pieces with momentum move in order of speed, highest to lowest.