Topalov is in The Zone! And with Carlsen's draw today vs. Naka he officially can't win now anyway. Topa is taking this down.
Norway Chess 2015 - Round 6

For the game between Topalov and Grischuk, I don't understand move 20 (Nc7). . .this move seems to lose him a minor piece for no reason

Some cool endgames to analyse if you're interested in learning more about the Carlsen-Nakamura endgame:
Gligoric-Euwe, Zurich 1953:
Petrosian-Keres, 1951 (notes by Dvoretsky):
Capablanca-Yates, 1930(again, notes by Dvoretsky)
And finally, an internet game (G/60), Piket-Kasparov (2000)
If you have The Art of Chess Analysis by Jan Timman, take a look at his analysis of Karpov-Hort, 1979. He points out that Hort could have reached this endgame, and probably could have drawn. More importantly, he discusses the various set ups and methods for drawing this endgame in detail.

I was there too. I guess I should've been working. But oh well.
Work? Work? Why would you do that when you can watch chess for hours!

I wonder if that knucklehead will start a new topic claiming Topolov is somehow cheating, like he did with Caruna at the Sinquefield Cup.
I can't find the topic anymore.

Grischuk's time strategy is a bit of a ploy. He plays his best at blitz, and tries to drag his opponents into that same sort of frenzied position. His strategy works so well because he's excellent at calculating. But when his opponents play as Topalov did, his strategy looks childish.
Grischuk is not really like Ivanchuk, who really is searching for absolute truth. Instead, he's trying to maximise his score by adding an extra element of uncertainty to the game.

I build but I'll keep my tablet with me at work during these important tournaments. That way I can work & keep up with the games simultaneously. Yeah, it makes me look lazy at times but so what? I don't care, it's freakin chess. They'll have to understand & get over it.
Luckily my boss, who happens to be me, is very reasonable about me following the chess at work.

Anand has played very well in this tournament. Hard to see anyone other than Magnus who could beat him in a match, though a tournament is a different kettle of wombats.
"Hard to see anyone other than Magnus who could beat him in a match"
I think any match between Anand and one of the other top players would be close to 50/50. He has a career minus against for example Nakamura and Caruana, and drew Gelfand over 12 games in 2012.
R+4 pawns vs R+3 pawns often wins in games between players rated~2300 FIDE. It wasn't a dead draw. It was a difficult draw that Naka played well.
In 2013, Naka contrived to lose just such an ending where he had the 4 pawns to Carlsen in a Norway tournament! Sure, it was blitz, but it just highlights how difficult these endings really are.