Made trickier by the fact that the information needs to be reliably checkable by Harry. And preferably not something he might already have known but mostly-forgotten.
He needs, in other words, a problem in class NP but not P. (Where P is “Potter” rather than “polynomial”.)
“The location and description of a specific item in your muggle bedroom” or “Chapter, author, title and quotation from a book that you read but I did not” and “details on your family that you haven’t yet told me about” seem like places to start. (The bedroom/family ones require he didn’t get any such information over the Christmas break, but from the sounds of it he didn’t.)
Made trickier by the fact that the information needs to be reliably checkable by Harry. And preferably not something he might already have known but mostly-forgotten.
He needs, in other words, a problem in class NP but not P. (Where P is “Potter” rather than “polynomial”.)
“The location and description of a specific item in your muggle bedroom” or “Chapter, author, title and quotation from a book that you read but I did not” and “details on your family that you haven’t yet told me about” seem like places to start. (The bedroom/family ones require he didn’t get any such information over the Christmas break, but from the sounds of it he didn’t.)