Thanks to old friend Cam Smith's HR, the Astros beat the Phillies today, meaning the Cubs will be 1 GB Philly with 15 to play while holding the tiebreaker over the Phillies.
If you are an optimistic fan, still a chance to have WC Round hosted at Wrigely
If you are a pessimistic fan, one more potential "out" the Cubs have to avoid missing the playoffs as the Phillies would just have to play 1 game worse than the Cubs the rest of the season for the Cubs to finish ahead of them.
Edit: Though for whatever reason the results of the day have caused the Cubs playoff odds to go down 0.2%. I wonder if its because the Braves won over a strong Rays team, making their upcoming 3 game series seem more difficult for the Cubs.