There's trivia, and then there's knowledge--deep, extensive, obsessive knowledge--masquerading as trivia. It's the kind of trivia that, if you know the answer, makes you feel triumphant, and if you don't, gives you an education. The kind of trivia based not on what we shouldn't be expected to know, but on what we should--if we're to consider ourselves true fans. Dennis Purdy, author of the just-published "Team-by-Team Encyclopedia of Major League...