Rules: One player is Monty Hall and shuffles the cards. ALL the cards.
He then places them face down in front of the other player (note that he doesnt know what is where either).
Monty Hall choose a different card and peeks under it. Then he reveals on card that the contestant didnt choose.
How does he reveal a card the contestant didn't choose if he only peeks at one card? By default isn't Monty stuck only being able to reveal the card he looked at?