1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 Nc6 8.Qd2 0-0 9.0-0-0 d5 This is one of the most critical positions of the Sicilian Dragon. White hopes that after possible simplifications a better control in the center will secure him an edge.
10.Kb1 Schulz,A: 'Ein nützlicher Wartezug mit einer giftigen Pointe.'
10...Rb8 Black prepares himself for an eventual exchange on c6, which would open the b-file and will leave the rook ideally placed on b8. [The main line goes 10...Nxd4 11.e5! which happened for instance in the game Nisipeanu-Radjabov, Kings Tournament 2009.]
11.Ndb5 It is very likely that after the present game the White players will look for advantage in other lines, perhaps after moves like [11.Be2 ; or 11.h4 h5 12.Be2 ]
11...a6 12.Na7 The knight on a7 looks somewhat misplaced, but all this is theory and up to the present game it was considered that White's prospects are slightly preferable.
12...e6 13.g4 [The alternative is 13.exd5 but it seems that both 13...exd5 and 13...Nxd5 offer Black a reasonable game.]
13...Re8! Just like on move 10, Black makes another "mysterious rook move". This continuation came unexpected for Nisipeanu, who started to use lots of time. Black's idea is to place ideally his pieces for the opening of the position. And indeed it is far from easy for White to find a good plan. [The usual continuation is 13...Qc7 ]
14.g5 Nh5 Strictly speaking, only this move is new, but already 13...Re8 is almost unexplored. [In a blitz game between two GMs Black played once the very weak 14...Nd7 and after 15.exd5 exd5 16.Nxd5 Nde5 17.Bb6 Qd7 18.f4 Nf3 19.Qf2 Nfd4 20.Bc4 Black could already resign in Balogh,C (2616)-Fier,A (2581)/Beijing (blitz) 2008.] The first critical moment.
15.Bf2 This apparently logical continuation removing the bishop from the e-file has a serious drawback - it leaves the problem of the knight on a7. [Since his main concern should be the stuck knight, White had to consider 15.Nxc8 d4 (weaker is 15...Rxc8 16.exd5 exd5 17.Nxd5 ) 16.Bf2 Rxc8 17.Ne2 and although Black solved all opening problems, White has a normal position.]
15...Bd7! 16.exd5 exd5 The second critical moment and practically the decisive moment of the game. Unfortunately for Nisipeanu, he was still thinking that White is better and didn't realize the danger of the position.
17.Qxd5? [Necessary was 17.Nxd5 Be6 18.c4 and at least White is not falling apart: (not 18.Nxc6 bxc6 19.Nb6 Bd5! ) 18...Bf5+ 19.Ka1 (Again the alternative 19.Bd3 is bad, because of the simple 19...Bxd3+ 20.Qxd3 Qxg5 ) 19...Ra8 20.Nxc6 bxc6 21.Nc3 even if after for instance 21...Qa5 Black has a more pleasant play.]
17...Ne5 18.Qb3 Losing the g5-pawn is fatal for White. [More stubborn was 18.h4 Be6 19.Qc5 Nd7 20.Qb4 ]
18...Qxg5 The material became equal, but White remained with the knight on a7. Besides, his kingside pawn structure is horrible. So basically the game is over.
19.Ne4 Qf4 20.Be2 Be6 21.Qa3 Nc4 22.Bxc4 Bxc4 23.Nd6 Bf8 24.Rd4 Qe5 [24...Qg5 with the idea 25.Rxc4 Qg2! was also strong.]
25.Rxc4 Bxd6 [Even quicker was 25...Qe2 26.Qc3 (or 26.Qd3 Qxf2 27.Nxe8 Rxe8 28.Rd4 Nf4 29.Qd2 Ne2 ) 26...Bxd6 27.Bd4 Bxh2 ]
26.Qd3 Bf8! On top of all, Nisipeanu was in severe time trouble.
27.a4 Rbd8 28.Qb3 Qd5 29.Rc3 Qd2 30.Be3 [The last chance for a longer resistance was 30.Rc7 ]
30...Qe2 31.Bb6 Rd1+ [White resigned in view of 31...Rd1+ 32.Rxd1 Qxd1+ 33.Ka2 Re1 34.Qc4 Qa1+ 35.Kb3 Rb1 ] 0-1