“As many as 12,000 people descended on KeyArena this week to watch teams of professional gamers square off in the International Dota 2 tournament. At stake in Saturday’s final round is a $6.5 million prize, part of an $18 million purse, the largest in e-sports history. E-sports, as competitive video gaming is known, is big business and is now attracting the likes of Amazon and Microsoft. Increasingly, the Seattle area is a focus of the industry.”