1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e5 7.Nb3 Be7 8.f3 Be6 9.Qd2 0-0 10.0-0-0 Nbd7 11.g4 b5 12.g5 b4 13.Ne2 Ne8 14.Ng3 [On my database, 26 games have gone 14.f4 a5 15.f5 a4 16.fxe6 axb3 17.exf7+ Rxf7 18.Kb1 bxc2+ 19.Qxc2 Bxg5 20.Bxg5 Qxg5 21.Ng3 and White has scored well from this position.]
14...a5 15.Kb1 a4 16.Nc1 b3! 17.cxb3 [17.Nf5 is much rarer, but has scored well. After 17...bxc2+ 18.Kxc2 d5 19.Nxe7+ Qxe7 20.exd5 Bf5+ 21.Bd3 Nd6 22.Bxf5 Nxf5 23.Kb1 Rab8 24.d6 Qe6 25.Rhe1 Black seems to have good compensation for his pawn.]
17...axb3 18.a3 [18.Nxb3 allows 18...Rxa2! 19.Kxa2 Qa8+ 20.Kb1 Bxb3 regaining the exchange (if Black wants it) and the white king is badly exposed. E.g. 21.Bd3 (21.Re1 Qa2+ 22.Kc1 Qa1# ) 21...Qa2+ 22.Kc1 Qa1+ 23.Bb1 g6 (23...d5? 24.Nf5 ) 24.Qc3 (24.Rde1 d5! 25.Qc3 Ba2 26.Qc2 Nd6-+ 27.-- Rc8 ) 24...Bxd1 25.Rxd1 Ng7 26.Ne2 Ne6 27.h4 Rb8 28.Qa3 Rc8+ 29.Kd2 Qxa3 30.bxa3 Ra8 and Black emerges a pawn ahead.]
18...Nc7 19.Nf5 d5 20.Nxe7+ Otherwise ...Bxa3 is a constant possibility.
20...Qxe7 21.h4 [21.exd5 Nxd5 22.Bd3 ]
21...f5 [21...d4 22.Bf2 f5 is also good.]
22.gxf6 [Black's pieces now get into the attack easily. An alternative was 22.exd5 Bxd5 23.Qc3 Rfc8 24.Bc4 in order to bring about some exchanges, although Black is still well-placed. E.g. 24...Kh8 25.Bxd5 Nxd5 26.Qd2 N7b6 27.Bxb6 Nxb6 28.Qd6 Qb7 29.Rd3 Nc4 30.Qd7 Qb8 31.Qxf5 Qc7! 32.Rxb3 (32.Qd7 Nxa3+! 33.bxa3 Qc2+ 34.Ka1 Rxa3+ mating) 32...Nd2+ 33.Ka2 Nxb3 34.Nxb3 and White may be able to hold on.]
22...Nxf6 23.Bg5 [23.Nd3 puts more pressure on the black position. E.g. 23...dxe4? 24.Bc5 winning the exchange.]
23...Rfd8 24.Qg2 Kh8 25.h5 h6 26.Bh4 Bg8 27.Bd3 Ne6 28.Qg6 From humble beginnings, this knight now has a very bright future. f4 and d4 beckon.
28...Rf8 29.exd5 Nf4 30.Bxf6 Rxf6 31.Qe4 Nxd5 32.Qe1 [32.Ne2 is safer]
32...Rxf3 Now White's position falls apart.
33.Rf1 Rxf1 34.Bxf1 Nf4 35.Qc3 Bh7+! 36.Bd3 [36.Ka1 Rxa3+! leads to a quick mate.]
36...Nxd3 37.Nxd3 Rd8 The pin is deadly.
38.Qxb3 Qd6 39.Kc2 e4 40.Ne5 [40.Nf2 e3+ 41.Nd3 e2 forces the win of the knight.]