The point of the question setter's request is this: if a person doesn't know an answer and asks a friend and gets an answer (be it right or wrong) it isn't posted on the Net for all to see, which is what happens when a question is asked and answered on AB. So if you do get an answer, detective, then anyone who cares to look gets it too so nothing gained. Also, many people have stopped doing the quiz as having spent weeks looking for an elusive answer it is freely given away. As Carrieann says, leave your answer sheet blank or try GFQ which is a lot easier. If you are really stuck then there is another site where you can ask for a hint which may enable you to come up with the right answer.