Kortchnoi Memorial Zurich Chess Challenge and Kortchnoi Memorial Open at Easter time from April 13th to 17th, 2017 in Zurich - Rapid & Blitz combined Invitation plus an Open tournament:

http://www.zurich-cc.com/en/ (Grandmaster Tournament)

http://www.zurich-cc.com/en/kortchnoi-open-news (Open)

https://en.chessbase.com/post/kortchnoi-zurich-chess-challenge-2017 (in english)

http://www.chessdom.com/kortchnoi-zurich-chess-challenge-2017/ (in english)

http://www.swisschess.ch/news-112/id-1317-april-in-zuerich-kortchnoi-zurich-chess-challenge-mit-weltklasseturnier-und-open.html (in german)

Venue:

Zurich Kongresshaus: http://www.kongresshaus.ch/de/ueber-uns/kongresshaus-zuerich.html

Sponsor:

The «IGC International Gemological Laboratories» is a Russian institute providing gemological services, such as diamond grading reports, enhanced diamonds identification, man-made / synthetic diamonds and imitation detection as well as certification of diamonds, gemstones and jewelry in the Russian Federation. IGC is the Russian branch of GCI — a group of gemological laboratories located wordwide.

Russian businessman and chess maecenas Oleg Skvortsov from «IGC International Gemological Laboratories» is the creator and main sponsor of the Zurich Chess Challenge series. He not only loves the royal game and supports chess events, but also plays high-level chess himself.

http://www.igc-gem.com/
 

Korchnoi Memorial Open tournament

Master section (> Elo 2000): http://www.chess-results.com/tnr257754.aspx?lan=0

Main section (< Elo 2050): http://www.chess-results.com/tnr257755.aspx?lan=0

Venue:

Zurich Kongresshaus: http://www.kongresshaus.ch/de/ueber-uns/kongresshaus-zuerich.html

Time control: 90 minutes per game plus 30 seconds increment per move from move one.

The winner of Zurich Chess Challenge (ZCC) 2015 and 2016 is also on top in 2017, now named Kortchnoi Zurich Chess Challenge (KZCC).

Hikaru Nakamura took his third Zurich Chess Challenge in a row. Additionally, he claimed victory in all three formats: the "opening blitz" (4 min plus 2 sec increment) which did not count for the overall classement but was used for the seedings and colours, won on better tie-break above Gelfand, the so-called "new classical" (45 min plus 30 sec increment), supposed to be Elo rated as a rapid, won outright, and the "final blitz" (10 min plus 5 sec increment), called "semi-blitz" by the spectators, won on better tie-break above Nepomniachtchi. GM Nakamura thus won the overall combined point standings as claer first (with the 'new classical games' counting double, 2 points for a win and 1 point for a draw). Hopefully, we did not mess up things..

Note: The closed Zurich Chess Challenge Tournament 2017 is not rated at all !! See for instance GM Anand’s FIDE chess profile (player card): https://ratings.fide.com/hist.phtml?event=5000017 (no games in April 2017). This seems bizarre - and was not communicated by the organisers, and thus not mentioned by most of the media.

In the 2017 KZCC Master Open, five players shared 1st place after seven rounds: GM Eltaj Safarli (winner on tie-break), GM Alexander Motylev, GM Aleksandr Rakhmanov, GM Ferenc Berkes and GM Gadir Guseinov. This additional Open (swiss system, classical chess, with 90 min plus 30 sec increment, Elo rated by FIDE) during the traditional ZCC, was held for the first time, and using a 'Korchnoi Memorial' claim.

Zurich Chess Challenge started in 2012. The first edition as a match, since 2013 as invitational round robin event with special point scoring, at the beginning classical and rapid chess were combined, then no longer classcial chess, only rapid and blitz. Zurich CC is played in week-end type of rapid and blitz exhibition held from a Thuersday evening or Friday to Monday. The KZCC 2017 exceptionally took place in the Kongresshaus, Zurich, all others in the Hotel Savoy, Zurich.

Zurich shows an exhibition type of tournament, similar at the former Amber chess tournament ambience, which explains some laxness and a comparatively brief duration of the whole event.

That Korchnoi Memorial took place as an open tournament 15-25 August 2017 in St. Petersburg, Russia during the traditional St. Petersburg Summer Chess Festival. Top players included five-time US Chess Champion GM Gata Kamsky, GM Alekseev, GM Shimanov, or GM Burmakin (243 players, most of them from Russia).

Evgeny Alekseev won the Korchnoi Memorial (Open) in St. Petersburg on better tie-break above Dmitry Kokarev, Gata Kamsky, and Aleksandr Shimanov, all at 7.5/9, as well as a rapid event that followed the open tournament.

http://theweekinchess.com/html/twic1190.html#11 (The Week In Chess)

http://es.chessbase.com/post/memorial-korchnoi-en-san-petersburgo-2017 (Chessbase in Spanish language)