Several pieces are placed on a chessboard. In a single move, pieces can only be removed and added to a single line of the board. Each square can contain a maximum of one piece. A move consists of removing a piece and, in the squares to the right of it (if there are any), placing and removing pieces as desired. That is, the squares to the right of the removed piece can remain as they were (occupied or empty) or change from occupied to empty or from empty to occupied.

The winner is the one who removes the last piece.

An example of a legal play: