The rapid rise of e-sports continues this weekend with the biggest and most lucrative tournament held to date. The fourth Dota 2 International takes place in Seattle's 17,000-seat Key Arena, where the world's best teams are competing for a share of a spectacular $10.5 million prize pool, highlighted by a first place award of over $4.8 million. This year the games will even be broadcast on ESPN. But do you know enough about BKBs and Roshan to follow along? Tune in to find out.