Sergash: June 2016, Karl Johan Ribbegren is a member of the Chess Federation of Monaco and has a FIDE rating of 2267, but no official title (a candidate master or CM maybe?). Born in 1955, he was 46 years old when he played this game. Carlsen was rated 2072, according to Chessbase.I checked the game with the program Komodo 10 - 64 bits.
<4.Bg5> Apaprently something new in tournament games for Carlsen. Until then, everyone had been playing 4.Qc2 here (see the games G Kacheishvili vs Carlsen, 2001 , C Braun vs Carlsen, 2001 , G Gaasland vs Carlsen, 2001 - the last one in the first round of the actual event).
<6.Qf3N!?> The theoritical novelty of this game, which is quite interesting. Until then, there had been for instance 6.Nf3 Bb7 7.Bd3 and now
A) 7...d5 8.cxd5 exd5 9.0-0 Nbd7
Christian Langeweg vs. Goesta Kvist, 7th Team World Championship Under 26 years old 1960, round 1, 1-0.
B) 7...h6 8.Bh4 d6 9.0-0 Bxc3 10.bxc3 Nbd7 11.Nd2
Lajos Asztalos vs. Birger Rasmusson, London Olympiad (England) 1927 (Men), Yougoslavia vs. Finland, round 14, draw.
C) 7...d6 8.0-0 Bxc3 9.bxc3 Nbd7 10.Nd2 h6 11.Bh4 e5
Efim Bogoliouboff vs. Paul Johner, Karlsbad (Czechoslovakia) 1929, round 17, 0-1.
<8.Qh3 h6!> Stronger is 8.Qg3! = /
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<9...Be7> As surprising as it might be, the best move for black here is apparently 9...g5! 10.Bg3 (or 10.Bxg5? hxg5 11.Qh6! Re8! 12.Nf3 Bf8 13.Qxg5+ Bg7
apparently completely safe for the black king!) Bxc3+! 11.bxc3 Kg7 = /
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<10.f4?!> Logical, but better is 10.Nf3 =.
<10...d5> First chance for Carlsen to get the upper hand: 10...Nb4! 11.Bb1! c5 