A gaming machine including a display device and game controller is provided. The display device includes reels having display positions for presenting symbols that include non-blank symbols and blank symbols. The game controller is configured to spin the reels horizontally to obtain a first game outcome including a first arrangement of the symbols at the display positions. In response to a determination that the first arrangement includes blank symbols, the game controller is configured to determine whether horizontally shifting non-blank symbols in either direction with respect to the blank symbols in each reel results in an optimal win. The game controller horizontally shifts the non-blank symbols with respect to the blank symbols in each reel to obtain a second game outcome in response to a determination that the shifting results in the optimal win. The game controller increases a credit balance by an award associated with the optimal win.