As you wish Scholar. I hope the small sample below proves instructive.

[Event "Aeroflot Open"]

[Site "Moscow RUS"]

[Date "2002.??.??"]

[White "Vasiukov,E"]

[Black "Van Wely,L"]

[Round "1"]

[Result "1-0"]

[WhiteElo "2524"]

[BlackElo "2697"]

[ECO "B53"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Bd7 6. Bxc6 Bxc6 7. Nc3 Nf6 8. Bg5 e6 9. O-O-O Be7 10. Rhe1 O-O 11. Kb1

[Very important prophylactic move in this line, and I TN consider it the best option at this juncture] Qa5 12. Qd2 Qa6 13. Nd4 Rfc8 14. f4 h6 15. h4 Qc4 16. g4 Kf8 17. f5 hxg5 18. hxg5 Nd7 19. fxe6 Ne5 20. Rh1 fxe6 21. b3 Qb4 22. Rh8+ Kf7 23. Qf4+ Bf6 24. Rh7 Kg8 25. gxf6 Kxh7 26. Qg5 Rc7 27. Nxe6 Rac8 28. fxg7 Kg8 29. Rh1 Bxe4 30. Rh8+ Kf7 31. Nxc7 Qxc3 32. g8=Q+ 1-0

[Event "Eurotel Trophy"]

[Site "Prague"]

[Date "2002.04.28"]

[Round "2"]

[White "Ivanchuk,Vassily"]

[Black "Gelfand,Boris"]

[Result "1-0"]

[Eco "B53"]

1.e4 c5 2.Nf3 d6 3.Nc3 Nf6 4.d4 cxd4 5.Qxd4 Nc6 6.Bb5 Bd7 7.Bxc6 Bxc6 8.Bg5 e6 9.0-0-0 Be7 10.Rhe1 0-0

11.Kb1 Qa5 12.Qd2 Rfc8 13.Nd5 Qxd2 14.Nxe7+ Kf8 15.Nxd2 Kxe7 16.f3 h6 17.Bh4 g5 18.Bf2 Bb5 19.b3 Nd7 20.Bd4 Ne5 21.c4 Ba6 22.a4 b6 23.Nf1 Ng6 24.Ne3 Bb7

25.Ng4 h5 26.Bf6+ Kd7 27.Nh6 Rf8 28.e5 d5 29.cxd5 Bxd5 30.Nxf7 g4 31.fxg4 hxg4 32.Nh6 Kc6 33.b4 Bxg2 34.Nxg4 Rac8 35.Rd4 Kb7 36.Ne3 Bh3 37.Kb2 Rc7 38.Nc4 Ka8 39.Red1 Rfc8 40.Rc1 Bf1 41.Rxf1 Rxc4 42.Rxc4 Rxc4 43.Rg1 Nf4 44.Kb3 Re4 45.h4 Nd5 46.b5 Re3+ 47.Kc2 Rh3 48.Rg8+ Kb7 49.Re8 Ne3+ 50.Kd2 Nf5 51.Rxe6 Nxh4 52.Re7+ Kb8 53.e6 Nf5 54.Be5+ Kc8 55.Rc7+ Kd8 56.Rxa7 Re3 57.Bf6+ Kc8 58.e7 1-0

[Event "POL-ch"]

[Site "Warsaw"]

[Date "2004.04.24"]

[Round "7"]

[White "Cyborowski,Lukasz"]

[Black "Lagowski,Patryk"]

[Result "1-0"]

[Eco "B53"]

1.e4 c5 2.Nf3 d6 3.Nc3 Nf6 4.d4 cxd4 5.Qxd4 Nc6 6.Bb5 Bd7 7.Bxc6 Bxc6 8.Bg5 e6 9.0-0-0 Be7 10.Rhe1 0-0 11.Kb1 Qa5 12.Qd2 Qb6 13.Nd4 Rac8 14.f3 a5 15.g4

[This is a typical way to conduct the attack and features often in the 4.Qxd4 line, it is usually followed by Nce2-g3-h5 at some point with good attacking chances] 15...a4 16.Be3 Qa6 17.h4 Nd7 18.Bg5 f6 19.Be3 Ne5 20.f4 Nc4 21.Qd3 Bd7 22.f5 Qa5 23.fxe6 Nxb2 24.Kxb2 a3+ 5.Ka1 Rxc3 26.Qd2 f5 27.exd7 Bf6 28.g5 Be5 29.Rb1 f4 30.Bg1 Qc7 31.Rxb7 Qc4 32.Kb1 f3 33.Bf2 Rd8 34.Nb3 Kh8 35.Bb6 Qb4 36.Ba5 Qxb7 37.Bxc3 f2 38.Rf1 Bxc3 39.Qxc3 Qxe4 40.Qd2 Qe5 41.c3 Rxd7 42.Qxf2 Qe4+ 43.Ka1 h5 44.gxh6 gxh6 45.Qd4+ 1-0

[Event "Bled op 21st"]

[Site "Bled"]

[Date "2000.03.25"]

[Round "4"]

[White "Zelcic,Robert"]

[Black "Savanovic,Aleksandar"]

[Result "1-0"]

[Eco "B53"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Qxd4 Nc6 5.Bb5 Bd7 6.Bxc6 Bxc6 7.Nc3 Nf6 8.Bg5 e6 9.0-0-0 Be7 10.Rhe1 0-0 11.Kb1 Qc7 12.Qd2 a6 13.Nd4 Rfc8 14.f3 b5 15.g4 Ne8 16.h4 Bf8 17.Be3 b4 18.Nce2 a5 19.g5 a4 20.Rc1 Qb7 21.Nxc6 Rxc6 22.h5 b3 23.cxb3 axb3 24.Rxc6 bxa2+ 25.Ka1 Qxc6 26.g6 Nf6 27.gxf7+ Kxf7 28.h6 g6 29.Bg5 Be7 30.Nd4 Qb6 31.Rc1 Rb8 32.Nc6 Rb7 33.Nxe7 Kxe7 34.Qc3 e5 35.f4 Ke6 36.Bxf6 Kxf6 7.fxe5+ dxe5 38.Rf1+ Ke6 39.Qc4+ Kd7 40.Rf7+ Ke8 1-0

[Event "Internet Section 07B g/8'+2""]

[Site "Dos Hermanas"]

[Date "2004.03.07"]

[Round "8"]

[White "Yu Shaoteng"]

[Black "Grebionkin,Vladimir"]

[Result "1-0"]

[Eco "B53"]

1.e4 c5 2.Nf3 Nc6 3.Bb5 d6 4.d4 cxd4 5.Qxd4 Bd7 6.Bxc6 Bxc6 7.Nc3 e6 8.Bg5 Nf6 9.0-0-0 Be7 10.Rhe1 0-0 11.Kb1 Qa5 12.Qd2 Rfd8 13.Nd5 Qxd2 14.Nxe7+ Kf8 15.Rxd2 Kxe7 16.Nd4 h6 17.Nxc6+ bxc6 18.Bh4 g5 19.Bg3 e5 20.f3 Nh5 21.Bf2 Nf4 22.Be3 f6 23.Red1 Rd7 24.g3 Ne6 25.h4 gxh4 26.gxh4 Rg8 27.h5 Ng5 28.Rd3 Ke6 29.Bd2 d5 30.a4 f5 31.exf5+ Kxf5 32.Rc3 Rd6 33.b4 d4 34.Rd3 Nh3 35.Rf1 Nf4 36.Bxf4 Kxf4 37.Re1 Rg3 38.Re4+ Kf5 39.c3 Rxf3 40.Rxe5+ Kxe5 41.Rxf3 Ke4 42.Rg3 Rd5 43.Kc2 dxc3 44.Rxc3 Rxh5 45.Rxc6 Kd4 46.b5 Rh3 47.Rc7 Rh2+ 48.Kb3 Rh3+ 49.Kb4 Rh1 50.Rxa7 Rb1+ 51.Ka5 h5 52.Rh7 Rh1 53.Kb6 h4 54.a5 h3 55.a6 h2 56.a7 Rg1 57.Rxh2 Rg6+ 58.Ka5 Rg1 59.b6 Kc5 60.Rc2+ Kd6 61.b7 Ra1+ 62.Kb4 Rb1+ 63.Kc4 1-0

[Event "Tivat op"]

[Site "Tivat"]

[Date "1995.??.??"]

[Round "2"]

[White "Vasiukov,Evgeni"]

[Black "Savanovic,Aleksandar"]

[Result "1-0"]

[Eco "B53"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Qxd4 Nc6 5.Bb5 Bd7 6.Bxc6 Bxc6 7.Nc3 Nf6 8.Bg5 e6 9.0-0-0 Be7 10.Rhe1 0-0 11.Kb1 Qc7 12.Qd2 Rfd8 13.Nd4 Rab8 14.f3 b5 15.g4 b4 16.Nce2 a5 17.Ng3

[Here we see the usual attacking recipe demonstrated by the master himself] Be8 18.Nh5 Nxh5 19.gxh5 Rdc8 20.Rg1 a4 21.h4 a3 22.b3 Kf8 3.Rg2 Bf6 24.Bxf6 gxf6 25.h6 Qc5 26.Rg7 Qe5 27.Re1 Rc3 28.f4 Qc5 29.e5 Bb5 30.Nxb5 Rxb5 31.Rxh7 Ke7

32.exd6+

1-0

[Event "Corus-B"]

[Site "Wijk aan Zee"]

[Date "2004.01.10"]

[Round "9"]

[White "Stellwagen,Daniel"]

[Black "Tiviakov,Sergei"]

[Result "1-0"]

[Eco "B53"]

1.e4 c5 2.Nf3 Nc6 3.Bb5 d6 4.d4 cxd4 5.Qxd4 Bd7 6.Bxc6 Bxc6 7.Nc3 Nf6 8.Bg5 e6 9.0-0-0 Be7 10.Rhe1 0-0 11.Kb1 Qc7 12.Qd2 Rfd8 13.Nd4 Rab8 14.f3 b5 15.g4 Be8 16.Nce2 h6 17.Be3 d5 18.e5!

[The thematic response in this and similiar positions, the tactical idea being that Qxe5 loses the Black Queen to Bf4 and the strategic idea is to keep the position closed. Take careful note of this idea, as its quite an important one to understand if you want success with this line] Nd7 19.Nf4 Nb6 20.Nh5 Nc4 21.Qc1 Kh7 22.f4 b4 23.f5 Rdc8 24.f6 gxf6 25.Bxh6 Na3+ 26.bxa3 fxe5 27.Bg7 bxa3+ 28.Nb3 Bg5 29.Bxe5 Qd8 30.Qxa3 a5 31.Qf8 Bh6 32.Qh8+ Kg6 33.Qg8+ 1-0

Anyone seriously interested in this 4.Qxd4 line should make a careful study of GM Evgeni Vasiukov games, as the old guy is the Guru of this system. I am not saying that I agree with Kamsky that 4. Qxd4 is as effective as 4. Nxd4 but it is certainly a useful weapon to include in ones repertoire, if only for occasional use.

Toppylov