Italy's Fabiano Caruana won the Zurich Chess Challenge 2013 which took place from 23 February to 1 March 2013.
The opening day included five rounds of blitz to decide the draw, which was won by Carlsen.
The 2015 tournament featured Fabiano Caruana, Viswanathan Anand, Vladimir Kramnik, Levon Aronian, Sergey Karjakin and Hikaru Nakamura.
The tournament was held from 13-19 February 2015 at the Hotel Savoy Baur en Ville in Zurich.
For determining the winner, although it was said before that the previous games between two must decide the result, they changed the rules midway and asked the players to play an armageddon game in which Hikaru Nakamura won with the black and ended up as the tournament winner.
A two-game exhibition match was played between Alexander Morozevich and Boris Gelfand, in the same time control as the Rapid portion of the main tournament.
American Hikaru Nakamura won the total standings by winning a blitz tournament half a point ahead of the Indian Viswanathan Anand and a full point ahead of Ian Nepomniachtchi.