teamdsl.rb

fragments = [
  ["The %s %s %s", 
   proc do |*args| 
     raise ArgumentError unless args.all{|a| a.respond_to?(:name) && a.respond_to?(:score)}
     [args[0].name, args[0].score > args[1].score ? "beat the" : "won against", args[1].name] 
   end]
]

class Team
  attr_reader :name, :score
  def initialize(name, score)
    @name = name
    @score = score
  end
end

fragments.map do |f|
  f[0] % f[1].call(Team.new("Cubs", 10), Team.new("Bears",5))
end