What happens after 21... Rxc8 22. Bg5 - pinning the knight and threatening Bxf6 and de. I think that would be quite annoying to black, and the rook might have to move off the c file to help out.

This is maybe made even stranger given that a year earlier, a game continued with 21.b3 instead of Rxc8, and White managed to win.

http://www.chessgames.com/perl/chessgame?gid=1330381

I can't see anything after 21...Rxc8 either. My thoughts were pretty much just 22.de de 23.Bg5 threatens to remove the bishop on d7's guard, kinda like shepi13 said - but there seems to be nothing after just 23...Be6

I'll analyze it tomorrow.

When I look at the typical GM games, my thinking usually goes "Wow! Why didn't I think of that before?".

However, when I look at Super GM games, it goes "#$%^&! What the heck are these dudes trying to do?". The funny thing is that when I plug in these moves into chess engines, they usually get a good or excellent evaluation from the engines. It was as if they were cheating and played using engines.

The last Super GMs whose reasoning I can still follow are Karpov and Kasparov. The younger generations of super GMs just completely baffle me. 

I've already used an engine, this time I'll use my head.

My thought was Bg5 before de, then Be6 could be met by d5 maybe?

I like that format too

hankas send me some tactics puzzles.

ofcourse I am a Dedicated Correspondance ChessPlayer, and so I am not used to analyze and make a Conclusion about Positions Quickly.... However, I still looked a bit to the Position while you were Explaining, and I looked at the Details you gave.... Thumbs-up of how you explained it and ( all ) the Details you gave!
And I hope that I can surely thumbs-up the Content of what you said as well, because you deserved it!

You and ' the Hankas ' are good ChessPlayers !