1.e4
It is really not easy to guess what opening Carlsen will play. My candidates against 1.e4 were the Aljechin, Open Ruy Lopez or the Dragon. The latter one is extremely dangerous in the hands of Magnus, especially in rapid. But Leko is not afraid to play against any of them. Otherwise he would have started with 1.d4, as it happened in one of their earlier encounter, which Peter duly won!
1...c5
2.Nf3
d6
3.d4
cxd4
4.Nxd4
Nf6
5.Nc3
g6
And in fact it is a Dragon! Not a big surprise, if you know that this was Carlsen's choice in his last two black games against 1.e4!
6.Be3
Bg7
7.f3
Nc6
8.Qd2
0-0
9.Bc4
Bd7
10.0-0-0
Interestingly, in the last 15(!) years Peter had to face the Dragon only once (against Fedorov in Batumi 1999), but there followed 10...Qb8 and White won in 57 moves.
10...Rc8
So far both player moved their pieces only once (except for Ng1-f3xd4), so they developed rather quickly. This is how grandmasters play - when they have a chance to do so - bring all their pieces into play as fast as possible.
11.Bb3
Ne5
A pictueresque position, all the knights are on the long diagonal, a kind of centre symmetry.
12.Kb1
Re8
13.h4
h5
14.Bh6
Threatens to take the "Dragon-Bishop"...
14...Nc4
15.Bxc4
Rxc4
... and Magnus allowed it to be taken.
16.Bxg7
Kxg7
17.Nd5
e5
18.Nxf6
Qxf6
But all these moves have been played already.
19.Nb3
[Actually 19.Ne2
happened just exactly four weeks ago, between the two young stars Karjakin and Carlsen in Baku, and that game was drawn after 55 moves.]
19...Rec8
And this is the "almost" novelty. So far Re6 happened in most of the games, for example in Lastin-Abbasov, Baku 2008 just eight days ago! This move was played by the relatively unknown Goumas in an old game (a month earlier in Plovdiv...)
20.Qxd6
Be6
21.c3
b5
And finally the real novelty, not following Zherebukh-Goumas any more, where white won in 65 moves.
22.Qd2
[22.a3
was possible to stop b4, but it looks threatening that the knight remains unprotected, although after the double attack 22...R4c6
White can still defend with 23.Qb4
I think White might look for some advantage in this line, although here Black has some compensation for the pawn, too.]
22...a5
23.Qg5
This is safe, to get rid of the enemy queen. [23.Nxa5
Ra4
24.Nb3
b4
Was anything but safe for white. After 25.cxb4
Bxb3
26.axb3
White has still three pawns in front of his king, but not in the right orientation! 26...Ra7
27.Qd6
Qf4
28.Rd5
Re8
And Fritz thinks it is +/-, but I find it unclear.]
23...Qxg5
24.hxg5
a4
25.Nd2
R4c7
26.a3
White is a solid pawn up, but his position is blocked.
26...Rd7
27.Kc1
f6
28.gxf6+
Kxf6
29.Nf1
Rxd1+
30.Kxd1
Rd8+
31.Ke1
Kg5
32.g3
Rd3
33.Nd2
Bc4
34.Nxc4
bxc4
35.Ke2
Rd6
36.Rh2
[36.Rd1
Rxd1
37.Kxd1
h4
38.gxh4+
Kxh4
39.b4
would be the winning move, but unfortunately Black is allowed to take it "en passant". 39...cxb3-+
Therefore the players agreed draw in the final position.] 1/2-1/2