  ==Learning== There seems to be some evolution in your thoughts about MHP. I received your email about the above mentioned article for Statistica Neerlandica, and I will respond to it shortly. In the mean time I want to try to know where you stand. *Is it your opinion, as well as of most (all) sources, that the player is offered the possibility to switch, only after the host has opened the door with the goat? *If the MHP is considered a probability puzzle, should the decision be based on some probability? *What probability should the decision be based on? (I do not ask how it may be calculated.)  Please just answer in short, no need to argue.   