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Don't really follow your logic Legolas but trust me it is a 66.66% chance if you change. By opening one of the two doors the quizmaster effectively tells you which one of those it is in, if it is in either. As it is a 66.66% chance of it being in one of those two you should change and guess with what he leaves.
Think of it this way. You first guess A and have a 33.33% chance of being right. By opening another door to reveal a chicken the quizmaster allows you to pick both of the other two at the same time, as you know which of those two it must be. So your chance of being right doubles.
By just saying it is 50/50 you are ignoring the fact that the quizmaster can't pick a door at random. He has to open one of the losing doors - which narrows down your options.
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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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