It is for fact that you can't reach high rating against an opposition which is low rated on average. If you force Carlsen to play against an opposition that is on average say 2550, he will find it very difficult to maintain a rating of 2880 ( this is because he will get very few points for wins, but will lose here and there, which will we devastating for his rating ).
It is hardly a fact, it was often said before that Carlsen's high rating was caused by his good results against "weak" opponents. In general the rating system is "fair", i.e. you get the "right" rating regardless if you play 2550s or 2750s.
You lose more ratings points drawing or losing to players rating significantly lower than yourself. That's why the top players cling onto being in the 'elite' circle where they get all the invites to the top tournaments. Those who haven't broken into that circle will likely struggle to keep their rating as consistent.
Vallejo back into the club, so is Rapport. Kramnik despite 2 losses on +/-0.0 and remained 10th. :)
Congratulations to China and Russia... and a brilliant showing by India.
I think that worst case ratingdeal is to play players on the way up. Because upcoming players are underrated. Johan Salomon is an example. He is coming up, has a rating at ca 2350, but plays like 2450+. Or try Isak Sjøberg, rated at Norwegian 1249, or even worse, Isak in January rated at ca 1060. Isak may go above 1600 this year, so it is a very bad ratingdeal to meet him. He already passed 1600 in rapid, and actually is planning to get 2500 later.
Magnus will of course beat Isak, and probably Johan too, but Johan can play draw or even win.
The best ratingdeal is to play rusty highrated players that still has a high rating, but doesnt play as much as they used too.
Those super-GM´s are playing a lot of tournaments and keeping themselves sharp. It is very hard work to lure some ratingpoints from them.
The young Chinese players are coming up, they are a very bad ratingdeal.
Among the many gratulations, let me say silently, that Hungary finished in second place, with only one defeat, suffered from the olympic champion China.
Two players died during this Olympiad. Chess is such a stressful game.
Does anyone know who took all the medals on each board? (Gold, Silver, Bronze on board 1, Gold, Silver, Bronze on board 2, etc...)
Everything should be here: http://chess-results.com/tnr140380.aspx?lan=-1