You almost always guess right. When presented with a number of alternatives and no logical way to choose, the GM rolls your Knowledge against 10+the number of "right" options-the number of "wrong" options. If you succeed, then the GM must steer you towards a good choice. If you succeed by more than ten, you are steered towards the best choice. A failed roll means you are given no information and a botch (a one on the wild die) means you are steered towards a bad choice, i.e. your intuition failed you.

Only one question per roll is allowed and this may not be used to short-circuit an adventure; just walking into a room and arresting the guilty party. At most this will point in the direction, but not give the answer.