Back to the Future II has a reputation for sketchy predictions when it comes to the shape of 2015. No hoverboards, Blade Runner-esque flying cars, or Jaws 19.

But the one prognostication the 1989 film might nail is the one many considered to be the unlikeliest: the Chicago Cubs winning the World Series.

As Reddit user gorg235 put it after posting about this in the Shower Thoughts community after Chicago clinched a playoff spot: “Mind. Blown.”

Major League Baseball’s postseason gets under way Tuesday, and the Cubs have earned the right to play in October and have a shot to make it to the Fall Classic. However, Chicago doesn’t have a lock on the feel-good story of the playoffs. The also long-suffering Pittsburgh Pirates also have made it to the postseason, and the two teams will face each other in the one-game National League Wild Card playoff Wednesday in Pittsburgh.

The Cubs and the Pirates have nurtured their lovable loser reputations over the years, and now both are poised to be this postseason’s scrappy underdog that beats the odds to win it all. But you can’t root for two underdogs. That’s why we’ve put together a chart that breaks down the teams and lets you decide which dark horse you should back.