Carlsen Wins the Qatar Masters
Whatever doubts and controversy may have surrounded the tiebreaks and playoffs of the London Chess Classic and the Grand Chess Tour, there aren't any questions of that sort when it comes to Magnus Carlsen's victory in the 2015 Qatar Masters. After being held to a draw in the first round by an IM, Carlsen played great chess the rest of the way, finishing with 7/9. Remarkably, last year's winner, Yu Yangyi, managed to match that score after a gritty last round win over Wesley So, and they went to a blitz playoff. Carlsen was a convincing 2-0 winner, and while 2015 wasn't the best year of Carlsen's career it wasn't bad either. He won this, London, the Tour, the World Rapid championship and Shamkir.
More on Qatar here, and more on Carlsen's (and others') 2015 achievements here.