[QUIZ] Paper Rock Scissors (#16)

[Lee Marlow]

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Attached is my attempt at learning some ruby reflection. I still have a long way to go.

-----Original Message-----
From: Ruby Quiz [mailto:[email protected]]
Sent: Friday, January 21, 2005 7:19 AM
To: ruby-talk ML
Subject: [QUIZ] Paper Rock Scissors (#16)

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class LRMJediPlayer < Player

def initialize( opponent )
super
@done = false
end

def choose
unless @done
ObjectSpace.each_object(Player) { |p|
unless p.class == Player || p.instance_of?(self.class)
def p.choose
:rock
end
end
}
@done = true
end
aper
end
end

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[Jacob Fugal]

Here is another 'cheater' (which does not redefine a method):

SYMBOLS = [ :rock,
aper,
:scissors ]
KILLER = { :rock => aper, aper => :scissors, :scissors => :rock }

class BHCheatPlayer < Player

def initialize( opponent )
super
@opp = Object.const_get(opponent).new(self)
end

def choose
KILLER[@opp.choose]
end

def result(you,them,result)
@opp.result(them,you,result)
end

end

This 'cheater' isn't gauranteed. Try it against this naive random player:

class RandomPlayer < Player
def initialize( opponent )
super
end

def choose
[ aper, :scissors, :rock ][ rand(3) ]
end

def result(you,them,result)
end
end

There's no gaurantee that the answer you get from @opp.choose will be
the same one the referee gets when he calls choose on the bot.

Jacob Fugal

 

[James Edward Gray II]

There's no gaurantee that the answer you get from @opp.choose will be
the same one the referee gets when he calls choose on the bot.

Still, it's a mighty clever trick against many strategies.

James Edward Gray II

 

[bananafishbones]

An alternate solution to the Rock, Paper, Scissors problem.

http://science.slashdot.org/science/05/01/25/0225218.shtml?tid=126&tid=14&tid=10
http://www.comp.leeds.ac.uk/vision/cogvis/games.html

 

[Florian Gross]

This 'cheater' isn't gauranteed. Try it against this naive random player:

def choose
[ aper, :scissors, :rock ][ rand(3) ]
end

Still, even in that situation you will pick an attack against a random
invalid move which means you'll still have a 50% chance of winning.