An electronic method of gaming includes displaying an evaluation area having columns of symbol display positions divided between first and second game instances by a border such that positions on a first side of the border are allocated to the first game instance and positions on a second side of the border are allocated to the second game instance. The method includes selecting symbols for the first and second game instances and displaying the selected symbols in response to initiation of a round of gaming. The method includes determining a winning game instance associated with the round. The winning instance is determined based on a round number and a position of the border divider. The method includes moving the border divider based on the determination of the winning game instance. The method includes determining an award based on symbols displayed at the symbol positions after the border divider is moved.