In Boll's game, the object is to eliminate all your opponent's pieces. There is, however, no capture. Each player has a set of pieces each of which moves like a Chess Rook. There also is a set of pieces that belong to neither player. These neutral pieces move in the same fashion (as a Chess Rook) and can be moved by either player on her turn.
 
At the end of a turn, if exactly two types of pieces are orthogonally adjacent, then they are all changed to be the third type. Thus, if at the end of the move, a neutral piece and one of your opponent's pieces are adjacent, they are both changed into your pieces.
 
Please send any comments or bug reports to zrfwriter@bluedino.net.