>>20779297No, a goat door is always opened.
However, even if a car door was opened however often, it wouldn't change anything about the case where the non-car door is opened. Obviously, if the car door is revealed, you switch to the now-visible car and win.
But at the point where the question is being evaluated, that's not what happened. What happened is that you got new information.
Lets say you picked door A.
World 1, you picked correctly- it was A. One of the other two doors is revealed; if you switch, you lose.
World 2, it was behind door B. Door C gets opened. If you switch, you win.
World 3, it was behind door C. Door B gets opened. If you switch, you win.
That's it, that's the entire thing.
