15.rb

class Game
  def initialize
    @TARGET = 15
    @numbers = (1..9).to_a
    @scores = [0,0]
    @turn = [0,1].sample # randomly decide who goes first
    return self
  end

  def run
    until (@numbers.empty? or @scores.include?(@TARGET)) do
      choice = @numbers.sample
      puts "Player " + (@turn%2).to_s + " choice = " + choice.to_s
      @scores[@turn%2] += choice
      @numbers.delete(choice)
      @turn += 1
    end
    result = @scores.include?(@TARGET) ? "winner" : "draw"
    puts "We have a " + result + "!\nPlayer 0: " + @scores[0].to_s +
         "\nPlayer 1: " + @scores[1].to_s
  end
end

g=Game.new
g.run