asiduodiego: My comments on this game:
7 Nd4. Strange looking move, but not bad per se: it's just a violation of the old principle, "don't move the same piece twice in the opening", but the idea is to make Black waste time defending the exposed b pawn.
8 ... c5?. The first mistake by Black, leading to the typical trade of "Two Minor Pieces vs Rook and Pawn". It doesn't lose material, and it's not a horrible mistake, but against an active player such as Aronian, it's not a good idea at all.
18 ... Rfe8. Why not the "obvious" 18 ... Nxb3 ?. Because, although it leaves White with doubled pawns, it's not a trouble at all, because the c4 square will be in complete White control, so Black will get in trouble opening the game in the Queenside. For example, if 19 cxb3 b4 20 axb4 cxb4 21 Na5, and White's position seems very comfortable with open diagonals for the Bishop and the Queen to jump to attack Black's pawns on the Queenside, and the Knight in excellent position to jump to b6 and create threats. The computer recommends the prophylactic move 18 ... Kh8 in this situation, though.
21 Rf1!. Strange looking move, but a deep attacking idea: the White f-pawn soon will be gone, so the idea is to set up a battery on the f-column to attack the Black King.
23 c3!?. It leads to open the c-column and gives White doubled pawns. But, Levon wants to get rid of the weakness that pawn represents, so he can release the Queen of the defense of the c pawn. The computer recommends the obvious idea of: 23 fxe5 dxe5 24 Qxf5 and the c-pawn is untouchable for the moment, but White soon will have to return to defend it. Perhaps not the best choice for Levon, but it's understandable.
26 ... Rf8? A bad decision, perhaps the decisive mistake in a subtle way. It defends the pawn, but dooms Black to passivity. Levon soon will take control of the open e-column, and the White rook will crush Black defenses.
31 ... Kh8? Underestimates the danger of Re7. As the game will show, Rf7 was necessary. Perhaps Ipatov was scared for his weak d-pawn.
34 Nd4 The Kingside will soon be under siege.
35 ... Rg6 Too passive. 35 ... Rb8 is more active. In time trouble, Ipatov is just trying to hold everything, but that leads to his defeat.
38 ... Qb4?? A blunder made in a lost position, but, Black was in severe time trouble. 38 ... Rg6 avoids mate, but Black's game is lost anyway.
39 Rxh7+!! A natural attacker such as Levon will never miss a combination such as this. The idea is 39 Kxh7 40 Qb7+ and after Kh6 there is no way to avoid Qg7+ Kh5, and one of the Knights will mate on f4.
Another great game by Aronian, and an excellent lesson for begginers of why you shouldn't (in general) make the trade of "rook + pawn" for "two minor pieces". After being on the brink of defeat yesterday, today Levon showed great accuracy.