The way I understand the playoff rules, all the Astros have to do is win their last 2 games and they are the wild card winner regardless of what Giants or Dodgers do ! Why ? Because if Giants lose even 1 of the next 2 or 3 games they are out. If Giants sweep, then Dodgers are out as they would trail Astros by 1/2 game as the one game playoff to decide the Division championship counts toward your overall record. This doesn't sound fair to me but that's the way it is. Correct me if I'm wrong but I believe that is the rule.