My implementation of greed dice game for Ruby Koans

greed_dice_game.rb

class Roll
  FIFTY_POINTS = 50
  HUNDRED_POINTS = 100
  THOUSAND_POINTS = 1000

  def initialize(rolls)
    @ocurrences = ocurrences_of_each_number(rolls)
  end

  def score
    a_1000_points_for_each_set_of_3_1s +
    a_100_points_for_each_1_not_part_of_a_set_of_3 +
    a_50_points_for_each_5_not_part_of_a_set_of_3 +
    a_100_times_the_number_for_each_group_of_3_numbers_other_than_1
  end

  private
    def ocurrences_of_each_number(rolls)
      ocurrences = Hash.new
      (1..6).each{ |number| ocurrences[number] = rolls.count(number) }
      ocurrences
    end

  def a_1000_points_for_each_set_of_3_1s
    (@ocurrences[1] / 3) * THOUSAND_POINTS
  end

  def a_100_points_for_each_1_not_part_of_a_set_of_3
    (@ocurrences[1] % 3) * HUNDRED_POINTS
  end

  def a_50_points_for_each_5_not_part_of_a_set_of_3
    (@ocurrences[5] % 3) * FIFTY_POINTS
  end

  def a_100_times_the_number_for_each_group_of_3_numbers_other_than_1
    ocurrences_of_others_than_1 = @ocurrences.select{|number| number != 1}
    score = 0
    ocurrences_of_others_than_1.each do |number, times| 
      score += number * HUNDRED_POINTS * (times / 3)
    end
    score
  end

end

def score(dice)
  Roll.new(dice).score
end

Pero ten cuidado, que como me dijeron a mi, el 100 no son los puntos para los que son distintos de 1 y 5, sino que es el multiplicador! lo digo de cara al nombre