 It is widely, though not universally, held that knowledge is partly analyzable in terms of justified true belief. But, as we’ve seen, Gettier examples show that having a justified true belief is not sufficient for knowledge. We need some anti-luck condition in addition to JTB to rule out cases where there is a JTB but not knowledge because, in some sense, the person in the Gettier situation is lucky to have a true belief given the way his evidence is related to the truth of his belief.