Monday's grand final match in the $US10 million Dota 2 tournament, The International 4, was so lop-sided -- so shocking -- that forum conspiracy theorists briefly postulated that the contest must have been rigged. No way, of course. I can explain what happened: why one team was able to crush the other so convincingly and why the changes developer Valve has made to Dota 2 in the past year deserve some of the blame for the International 4's disappointing final clash.