That logic doesn't work Legolas as there aren't two doors there are three. Remember that when the quizmaster opens one he doesn't open one at random - he opens one without a prize. That is very significant as if you haven't picked the right one (i.e. 66% of the time) then he only has one door he can open. The fact that when he asks you if you want to change there are only two doors is completely irrelevant.
But we are going round in circles on this one. The maths community of the world is actually on my side. So there!!! 
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[img]\"http://img1.ranchoweb.com/images/sproutman/certwist.gif\" alt=\" - \" /><br /><br /><i>\"And the angels all pallid and wan,<br />Uprising, unveiling, affirm,<br />That the play is the tragedy, man,<br />And its hero the Conquerer Worm.\"</i><br /> - Edgar Allan Poe
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