In the chess game of San Francisco drinking establishments, your opening move is everything. There are seasonal cocktails, classic ones, bar tenders that mad dog your drink requests, and those that will happily jabber on about boozy ingredients and housemade tinctures for hours. Thus, Eater has culled through the best and the worst of them, bringing you the Eater Bar Heat Map. Consider it your back-pocket guide to the new and old essential bars of San Francisco. As always, state your proposed additions and subtractions in the comments, or send us a good old-fashioned email.