It has been over a year since I saw the movie, so I apologize if I'm not descriptive enough. If you have seen the movie, then you know that scene where Kevin Spacey says there are 3 doors, and the main character picks one, then the other is eliminated, and so the main character increases his chances of picking the right door, by then switching his choice. I didn't understand the logic in this, wouldn't it just be 50/50? According to the movie, he increased his chances of over 50%, even though it's been narrowed down to two doors. Totally confused me.