From: James Edward Gray II <james@...>
Date: 2007-03-05T09:48:37+09:00
Subject: Re: [QUIZ] GOPS (#116)

On Mar 4, 2007, at 3:55 PM, Christoffer Lern� wrote:

> Here is an example of what can be done with a static strategy.

Which means I just had to make a static player slayer.  ;)

This guy will crash if he plays a non-static bot or even if he plays  
against multiple static bots without clearing his memory, but the  
result is still fairly entertaining:

Final Score
-----------
Muppet:  41
Observant:  40
=> Muppet won the game.

Final Score
-----------
Muppet:  11
Observant:  80
=> Observant won the game.

Final Score
-----------
Muppet:  11
Observant:  80
=> Observant won the game.

Final Score
-----------
Muppet:  11
Observant:  80
=> Observant won the game.

Final Score
-----------
Muppet:  11
Observant:  80
=> Observant won the game.

My initial plan was to make him smarter, but I found not being passed  
a bot name a pretty big barrier to that.

Here's the code:

#!/usr/bin/env ruby -w

class Player
   CARDS = (1..13).to_a

   def initialize
     @cards_left = CARDS.dup
     @wins       = Array.new
   end

   def play_card(card)
     @cards_left.delete(card)
   end

   def win_card(bid_card)
     @wins << bid_card
   end

   def score
     @wins.inject { |sum, card| sum + card } || 0
   end
end


class Observant < Player
   BRAIN = "memory.dump"

   def initialize
     super

     @bids_left = CARDS.dup
     @opponent  = Player.new

     @memory    = File.open(BRAIN) { |file| Marshal.load(file) }  
rescue Array.new
     @this_game = Array.new
   end

   def bid_on_card(card)
     @bidding_for = card
     @last_play   = choose_a_card
   end

   def record_result(opponents_card)
     if @last_play > opponents_card
       win_card(@bidding_for)
     elsif opponents_card > @last_play
       @opponent.win_card(@bidding_for)
     end

     @bids_left.delete(@bidding_for)
     play_card(@last_play)
     @opponent.play_card(opponents_card)

     @this_game[@bidding_for] = opponents_card
   end

   def memorize_game
     File.open(BRAIN, "w") { |file| Marshal.dump(@this_game, file) }
   end

   private

   def choose_a_card
     if @memory.empty?
       @bidding_for
     else
       expected = @memory[@bidding_for]
       expected == 13 ? 1 : expected + 1
     end
   end
end

if __FILE__ == $PROGRAM_NAME
   observant = Observant.new
   13.times do
     $stdout.puts observant.bid_on_card($stdin.gets[/\d+/].to_i)
     $stdout.flush
     observant.record_result($stdin.gets[/\d+/].to_i)
   end
   observant.memorize_game
end

__END__

James Edward Gray II