According to the most common Go Moku, the board should be 15x15 instead of 13x13. Shouldnt you make the 15 board the default one instead of the 13?
Board size
You can change the size of the board in the sittings before starting a game. You just have to click on the button "Chat & game settings" or (Alt+C) using the keyboard. FlyOrDie Dryxel