n queens loop

gistfile1.rb

  def coordinates_for_next_move
    while attackable(@row,@column)
      @column += 1 if @column < @size
      while @column >= @size
        @row = @positions.last[0]
        @column = @positions.last[1] + 1
        @positions.delete_at(@positions.count - 1)
      end
    end
    place_next_queen
  end

# place_next_queen shovels the row and column to the positions array and then calls coordinates_for_next_move