def solved?
      letter = won_across?
      return letter if letter
      letter = won_up_and_down?
      return letter if letter
      letter = won_diagonally?
      return letter if letter
      false
    end
def solved?
      letter = won_across?
      return letter if letter
      letter = won_up_and_down?
      return letter if letter
      letter = won_diagonally?
      return letter if letter
      false
    end
Returns true if the board has a wining pattern