Move 3 Nc6 (white to move)
FEN: r1bqkbnr/pp1ppppp/2n5/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 2 3
Comment: This is rapidly becoming the most commonly played move amongst the top GMs.

Move 3 d4 (black to move)
FEN: r1bqkbnr/pp1ppppp/2n5/2p5/3PP3/5N2/PPP2PPP/RNBQKB1R b KQkq - 0 3
Comment: This is the more-or-less Classical approach: move a couple of pawns, develop rapidly and look for ways to utilize those pieces.

Move 6 e5 (white to move)
FEN: r1bqkb1r/pp1p1ppp/2n2n2/4p3/3NP3/2N5/PPP2PPP/R1BQKB1R w KQkq - 0 6
Comment: Sveshnikov - The idea is to control the center with his extra pawn (Pd7 & Pe7 vs. White's Pe4) and to do so in a way that lets him activate his two bishops more fully than in a Scheveningen; it's somewhat like a Boleslavsky set-up. But, White's pieces aren't placed the same as in a Boleslavsky; instead White goes directly for the weak spots and induces as much weakness in Black's position as possible (capitalizing if possible) .

Move 6 Ndb5 (black to move)
FEN: r1bqkb1r/pp1p1ppp/2n2n2/1N2p3/4P3/2N5/PPP2PPP/R1BQKB1R b KQkq - 1 6
Comment: aiming to invade at d6 to gain a bishop for the knight. It forces Black to play ...d7-d6 which blocks-in Bf8. Black will have at least one bad bishop and a weak d5 square.

Move 7 Bg5 (black to move)
FEN: r1bqkb1r/pp3ppp/2np1n2/1N2p1B1/4P3/2N5/PPP2PPP/R2QKB1R b KQkq - 1 7
Comment: Removing Nf6 will ensure White control of d5 for some time and perhaps force a weakened king-side pawn structure which might be exploited later.

Move 9 b5 (white to move)
FEN: r1bqkb1r/5ppp/p1np1n2/1p2p1B1/4P3/N1N5/PPP2PPP/R2QKB1R w KQkq - 0 9
Comment: When this opening was originally played it was thought ...Bc8-e6 was best, but ...b5 (the Chelyabinsk Variation) has become most common. There's the immediate threat of ...b4 and it offers ...Bc8-b7 as an option. It also prevents Bf1-c4.

Move 11 c3 (black to move)
FEN: r1bqk2r/5ppp/p1np1b2/1p1Np3/4P3/N1P5/PP3PPP/R2QKB1R b KQkq - 0 11
Comment: preparing several things at once: Bf1-e2 while avoiding ...Nd4 and clearing for Na3-c2. After all that it holds square b4, so that a2-a4 threatens massive destruction of Black's queen-side.

Move 12 Bg5 (white to move)
FEN: r1bqk2r/5ppp/p1np4/1p1Np1b1/4P3/N1P5/PP3PPP/R2QKB1R w KQkq - 1 12
Comment: Black has the two bishops, but no immediate way to use them, so he develops normally and hangs on for dear life.

Move 15 Bc4 (black to move)
FEN: r1bq1rk1/5ppp/2np4/p2Np1b1/R1B1P3/2P5/1PN2PPP/3QK2R b K - 1 15
Comment: The plan with Bf1-c4 is one Kasparov has played and it tries to keep control of the position to allow a longer build-up before White tries to win.

Move 16 Rb8 (white to move)
FEN: 1rbq1rk1/5ppp/2np4/p2Np1b1/R1B1P3/2P5/1PN2PPP/3QK2R w K - 2 16
Comment: prevents Bc4-b5, threatens Pb2 and avoids problems stemming from the pin on Pa5

Move 17 Kh8 (white to move)
FEN: 1rbq1r1k/5ppp/2np4/p2Np1b1/R1B1P3/1PP5/2N2PPP/3QK2R w K - 1 17
Comment: At last, Black can preparing some offense with ...f7-f5, though it's hard to see how he can achieve much when Rb8 & Nc6 are tied to the defense. On the other hand, Nc2 isn't particularly active at the moment, so White hasn't many defensive pieces on the king-side.

Move 19 Bxf5 (white to move)
FEN: 1r1q1r1k/6pp/2np4/p2Npbb1/R1B5/1PP5/2N2PPP/3Q1RK1 w - - 0 19
Comment: This seems to me to be a key moment for White: it's from here she has to decide on a middle-game plan which will range across the entire board. Black isn't making any specific threats just yet, but the two bishops (Bf5, Bg5) and Rf8 look ominous. I'd suggest not letting Bg5 move to clear for ...Qd8-g5 or ...Qd8-h4, but there is also ...Qd8-e8-g6, so White has to act fast before a calamity happens.

Move 22 Ne7 (white to move)
FEN: 1r1qbr1k/4n1pp/3p4/p2Np1b1/8/RPPB4/2N1QPPP/5RK1 w - - 6 22
Comment: If he's going to fight on light squares then it certainly makes sense to consider ...Ne7, but it weakens Pa5. A key question still remains and that's how Black might try to use Bg5 and how White can reposition Nc2. It might become obvious that Nc2-e3 is necessary, even if it allows Black to trade-off Bg5.

Move 24 Qb6 (white to move)
FEN: 1r2br1k/6pp/1q1p4/p2Bp1b1/8/RPP5/2N1QPPP/5RK1 w - - 1 24
Comment: "hitting" e3 to make Nc2-e3 less appealing to White. It also stays in touch with Pa5 and Pb3 and cooperates with Bg5 at a distance. This isn't a plan to win the game, just to maintain cohesion of his position and to keep a little pressure on White. Now is the time for White to return to the main idea of removing Pa5 to make Pb3 a passer.

Move 25 Nxb4 (black to move)
FEN: 1r2br1k/6pp/1q1p4/3Bp1b1/1N6/R1P5/4QPPP/5RK1 b - - 0 25
Comment: Though cxb4 would make a passer it also allows ...Bb5 and leaves Nc2 awkwardly placed. Nb4 can be useful and there is still some hope of playing simultaneously against Pd6 and Ph7.

Move 26 Qc5 (white to move)
FEN: 1r2br1k/6pp/3p4/2qBp1b1/1N6/R1P5/4QPPP/5RK1 w - - 1 26
Comment: threatening ...Rxb4 and ...Qxd5 or ...Bb5

Move 27 c4 (black to move)
FEN: 1r3r1k/6pp/3p4/1bqBp1b1/1NP5/R7/Q4PPP/5RK1 b - - 0 27
Comment: White courageously gambits a pawn to keep Rf1 securely defending Pf2 and to keep solid light-square control (so, after all this Black does get to trade a bishop for the knight, just not Bg5!) .

Move 29 Ra8 (black to move)
FEN: R4r1k/6pp/3p4/2q1p1b1/1rB5/8/Q4PPP/5RK1 b - - 1 29
Comment: Forcing rook and queen trades will lead to a drawn bishop of opposite color ending. Bc4 is safe for the moment as White threatens Rxf8#.

Move 37 e4 (white to move)
FEN: 4r3/6kp/3p2p1/2q3b1/4p3/5BP1/Q4PKP/1R6 w - - 0 37
Comment: At the end Polgar could force an entry to Black's king with 37. Ra7+ Kh6 38. Bxe4 Rxe4 39. Qf7. Curiously, Polgar also drew a pawn-down ending against Kramnik (in this event) , beginning with this same opening. One has to wonder what brought the position to this; where White was doing well, but then has to give a pawn and hope to draw. Isn't this a mysterious kind of thing? I suppose White was not fully developed and active (Nc2) and holding back to avoid trades gave Black compensation for the other weaknesses in Black's position. In the end it was those same weaknesses which gave White compensation for the lost pawn. It's back to the drawing board to find a better plan for White.