This nine-round Swiss event is taking place in Hersonissos, Greece and runs from today (October 28) through November 7. Lots of top players are participating, but as Vladimir Kramnik isn't among them it's just about a done deal that Fabiano Caruana and Wesley So will be the rating qualifiers for next year's Candidates tournament.
But never mind who's not playing; here's a partial list of the top players who are: Levon Aronian, Shakhriyar Mamedyarov, Alexander Grischuk, Anish Giri, Radoslaw Wojtaszek, Maxim Matlakov, Teimour Rajdabov, David Navara, Ian Nepomniachtchi, Nikita Vitiugov, Michael Adams, Boris Gelfand, Baadur Jobava, Jan-Krzysztof Duda, and Pavel Eljanov.
Tournament website here.