22 Jan '13 20:31>2 edits
Not often you see this opening on the top flight boards.
Y. Hou - M.Carlsen, Tata Steel 2013
1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d4 exd4 5. e5 Nd5 6. Bc4 Nb6 7. Bb3 d5 8. cxd4 Bg4 9. Be3 f6 10. O-O Qd7 11. h3 Bh5 12. e6 {If Black takes this cheeky pawn then 13.Ng5 or 13.Re1 looks like the reply.} 12... Qd6 13. Nc3 O-O-O 14. a4 a5 15. Nb5 Qxe6 {Now with Black King castled and the b3 Bishop not protected by the a-pawn Black takes the pawn.} 16. Bf4 Rd7 17. Re1 Qf7 18. Rc1 Bb4 19. Re3 g5 20. Bh2 Nc4 {Closing that open c-file, the c7 square was getting hot.} 21. Bxc4 dxc4 22. Qc2 Bxf3 23. Rxf3 Nxd4 24. Nxd4 Rxd4 25. Be5 Rd2 26. Qf5+ Qd7 27. Qxf6 Re8 28. Bg3 Rd4 29. Rf1 g4 30. hxg4 Rxg4 31. Rf4 h5 32. Rxg4 hxg4 33. Rc1 c3 {Rather than tie down a piece defending the pawn. Magnus sacs it isolating the a-pawn and closes that dangerous looking c-file.} 34. bxc3 Bc5 35. Qg5 b6 36. c4 Re4 37. Qg6 Re2 38. Kf1 Qd2 39. Qxg4+ Kb8 40. Qxe2 Qxc1+ 41. Qe1 Qxc4+ 42. Qe2 Qxa4 {Thiis is Witchcraft.} 43. Be5 Bd4 44. Bxd4 Qxd4 45. g4 Qd5 46. Qe8+ Kb7 47. Qa4 b5 48. Qxa5 Qd1+ 49. Qe1 Qxg4 50. Qe5 Qc4+ 51. Kg2 Qc6+ 52. Kf1 b4 53. f4 b3 54. f5 Ka6 55. Qa1+ Kb6 56. Qh8 Qc1+ 57. Kg2 Qc2+ 58. Kh1 b2 59. Qb8+ Ka5 60. Qa7+ Kb4 61. Qb7+ Ka3 62. Qf3+ Qb3 63. Qa8+ Qa4 64. Qf3+ Ka2 65. Qd5+ Ka1 66. Qe5 c5 {Black is playing next Qd4. 0-1.}
Y. Hou - M.Carlsen, Tata Steel 2013
1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d4 exd4 5. e5 Nd5 6. Bc4 Nb6 7. Bb3 d5 8. cxd4 Bg4 9. Be3 f6 10. O-O Qd7 11. h3 Bh5 12. e6 {If Black takes this cheeky pawn then 13.Ng5 or 13.Re1 looks like the reply.} 12... Qd6 13. Nc3 O-O-O 14. a4 a5 15. Nb5 Qxe6 {Now with Black King castled and the b3 Bishop not protected by the a-pawn Black takes the pawn.} 16. Bf4 Rd7 17. Re1 Qf7 18. Rc1 Bb4 19. Re3 g5 20. Bh2 Nc4 {Closing that open c-file, the c7 square was getting hot.} 21. Bxc4 dxc4 22. Qc2 Bxf3 23. Rxf3 Nxd4 24. Nxd4 Rxd4 25. Be5 Rd2 26. Qf5+ Qd7 27. Qxf6 Re8 28. Bg3 Rd4 29. Rf1 g4 30. hxg4 Rxg4 31. Rf4 h5 32. Rxg4 hxg4 33. Rc1 c3 {Rather than tie down a piece defending the pawn. Magnus sacs it isolating the a-pawn and closes that dangerous looking c-file.} 34. bxc3 Bc5 35. Qg5 b6 36. c4 Re4 37. Qg6 Re2 38. Kf1 Qd2 39. Qxg4+ Kb8 40. Qxe2 Qxc1+ 41. Qe1 Qxc4+ 42. Qe2 Qxa4 {Thiis is Witchcraft.} 43. Be5 Bd4 44. Bxd4 Qxd4 45. g4 Qd5 46. Qe8+ Kb7 47. Qa4 b5 48. Qxa5 Qd1+ 49. Qe1 Qxg4 50. Qe5 Qc4+ 51. Kg2 Qc6+ 52. Kf1 b4 53. f4 b3 54. f5 Ka6 55. Qa1+ Kb6 56. Qh8 Qc1+ 57. Kg2 Qc2+ 58. Kh1 b2 59. Qb8+ Ka5 60. Qa7+ Kb4 61. Qb7+ Ka3 62. Qf3+ Qb3 63. Qa8+ Qa4 64. Qf3+ Ka2 65. Qd5+ Ka1 66. Qe5 c5 {Black is playing next Qd4. 0-1.}