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In round one of the Corus tournament, the game Karjakin-Anand reached this position.
Karjakin played 23.Qc3.
The commentators say this move is an error. Can someone explain why this move is a mistake, and what Karjakin should have played?
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I am pretty sure I can't really explain it, but here are some quote's:
"Karjakin said after the game that up to 23.Qc3 it was all preperation and theory for him and that he knew and analysed the Leko vs Vallejo game. He also said that he forgot his 23th move, that the move he ended up playing, 23.Qc3, was a weak move and that after another weak move, 24.Bg2, he was in a losing position. Then they both played accurate but black's position was better". from: http://www.chessgames.com/perl/chessgame?gid=1385670
"By the way, Anand's 24...Nc7?? looks a capital blunder, the knight can be taken. Still, Black's position was very difficult even without committing such a suicide. I analyzed this line in 2004 and reached the position after 22.h4, assessing it as clearly better for White. Anand's choice of such a difficult line is very surprising.
...I sigh in admiration of Anand's computer analyses depth! After a healthy 3-minute thought the computer just REVERSED the assessment! We were wrong; it is absolutely fantastic!"
from:http://e3e5.com/eng/petersburg/competitions/article.html?162 (Sakaev)
Here's a link to a review of the game by Lubomir Kavalak in the Washington Post: http://www.washingtonpost.com/wp-dyn/content/article/2006/01/15/AR2006011500902.html
This probably doesn't really explain much about Qc3?!, but the key to your answer must be there... 
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Indeed, why 23.Qc3 is bad is a big question. And What else is another good one. It's seem that Karjakin follow a preparation and forget this move...
In other hand, 24. ... Nc7 is a so strange and magical move !!
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I think Be2 may be better.
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