refactored_current_player.rb

class Game
  attr_accessor :board, :player_one, :player_two, :ui, :player_first_move
  def initialize(settings)
    @board = settings[:board]
    @player_one = settings[:player_one]
    @player_two = settings[:player_two]
    @player_first_move = settings[:player_first_move]
    @ui = UI.new
  end

  def current_player
    if total_markers(MARKER_X) > total_markers(MARKER_O)
      player_two
    elsif total_markers(MARKER_O) > total_markers(MARKER_X)
      player_one
    else
      player_first_move
    end
  end
  ...
end