New York's hottest club is a boardroom, but not the kind you might think. These 20 and 30somes are gathering once a week for drinks, vibes, and back gammon. The game of both strategy and luck dates back centuries and has historically been associated with old Hollywood, double sixes, bond villains, fancy that, and mega stars of the past.But the tables have turned. Back and social clubs are popping up across the country as the centuries old game takes on a new life. It used to be just like a couple of grandpa ...