It is true that the move 13...Bf8 loses two tempi by undeveloping the KB, but White has also consumed two tempi upon the moves e5 and Qg3. Black may be able to develop the KB by ...g6 and ...Bg7, or else to castle on the Queen side and to play for a King side pawn storm which includes the move ...g5.

14...c5 disturbs the Queen side pawns. Having weakened the black squares on the King side, 14...Qc7 prepares to castle on the Queen side.

15...c4 may be the losing mistake if 14...c5 isn't. After 17 b3 Black's KIng will be exposes to attack on either wing. Black may be lost with best play after this.

21...Ng5 will lead to this N getting trapped and the move 30..Be3 lets the Knight go.

Maybe now its two points difference?

23.Rfd1 Rb4
24.Rd4 Ne4
25.Rb4 Bxb4
26.Bd3 Bf8
27.Bxf8 Kxf8
28.Bxe4 dxe4
29.Rd1 Qe7
30.Rd6 is winning

"Most of the mess was caused by Ivanchuk's odd knight tour of death. He moved his knight from d7 to c5 to e4 to g5, where it was duly trapped and lost."

This move is currently in fashion among GMs. Also frequently played at Master level are 6. Be2 as in Wang Hao vs M Kobalia, 2008, 6. Be3 as in Radjabov vs Ivanchuk, 2008 and 6. g3 as in Svidler vs Rublevsky, 2007.

<6...bxc6 7. Bd3 d5 8. O-O Nf6 9. Qf3>

With this move, White steers the game into familiar territory -- since he previously played it in Leko vs Mamedyarov, 2007.

<9...Be7 10. Qg3 Nh5>

Perhaps worth trying is 10...O-O as in Karjakin vs Rublevsky, 2007.

<11. Qf3 Nf6 12. e5 Nd7 13. Qg3 g6 14. Bh6 c5>

Don't know if it's a novelty, but this is the only game with this move currently in the chessgames.com databse. I suspect we'll not see much of the move in the future as it makes it difficult for Black to equalize.

Instead, Black can try 14...Bf8 which transposes to the two draw games M Vachier Lagrave vs V Laznicka, 2008 and I Kurnosov vs Movsesian, 2008.

<15. Na4 c4 16. Be2 Bb7 17. b3 Bc6 18. Nb2 Rb8 19. Nd1 Nc5 20. Ne3 Ne4 21. Qh3 Ng5 22. Qg4 c3 23. a3 Bb5?>

This not so obvious mistake appears to
give White a decisive advantage. Instead, Black can try and hold with 23... Ne4 (also recommended by <ezzy> above), when play might continue 24. Rfd1 Bh4 25. g3 Bg5 26. Bxg5 Nxg5 27. Qd4 Qa5 28. b4 Qb6 29. Qxc3 Bb5 30. Bxb5+ axb5 31. Ng4 Ne4 32. Qf3 O-O with only a small White advantage.

<24. Bxb5+ axb5 25. f3!!>

Attempting to save the Knight meets with a withering attack on the helpless King:

If 25... f6, then White wins after
26. exf6 Bxf6 27. h4 Nf7 28. Qxe6+ Be7 29. Bg7 ;

If 25... d4, then White wins after 26. Nd1 d3 27. cxd3 Rb6 28. f4 f5 29. exf6 Nf7 30. Bg7 Bxf6 31. Bxh8 Bxh8 32. Nf2 Kf8 33. Qe2 ;

If 25... f5, then White wins after 26. exf6 Bxf6 27.h4 Nf7 28. Qxe6+ Qe7 29. Qc6+ Kd8 30. Rfd1 d4 31. Nd5 Qd6 32. Qxd6+ Nxd6 33. Nxf6 .

<26. Rae1>

Also winning is 26. Rfe1 d4 27. Nf1 d3+ 28. Kh1 d2 29. Red1 f5 30. exf6 Nf7 31. Bg7 Rg8 32. Qh4 h6 33. fxe7 Rxg7 34. Qf6 Rg8 35. Qxc3 Kxe7 36. Nxd2 .

<26... d4 27. Nd1 d3+ 28. Kh1 dxc2 29. Nf2 Bc5 30. Nd3 Be3 31. Bxg5 Bd2 32. Re2 O-O 33. Nc1 b4 34. Bxd2 cxd2 35. Rxd2 bxa3 36. Rxc2 Rfc8 37. Qe4 Rxc2 38. Qxc2 Qd4 39. Na2>

Also winning is 39. f4 Qb2 40. Rf2 Rd8 41. Kg1 g5 42. g3 Qxc2 43. Rxc2 .

<39... Qxe5 40. b4 Rd8 41. h3 h5 42. Rb1 Qe3 43. Rd1 Rd5>

Also losing for Black is 43... Rxd1+ 44. Qxd1 Qf2 45. Qa1 Qb2 46. Qxb2 axb2 47. Nc3 Kf8 48. Kg1 h4 49. Kf1 Ke7 50. Ke2 Kd7 51. Kd2 .

<44. Qb1 Qe2 45. Re1 Qd2 46. Rc1 Rd8 47. b5 Rb8 48. Rc3 h4 49. b6 Qd6 50. Rb3 Rb7 51. Nc3 Qc6 52. Rxa3 Qxb6>

No help for black is 52... Rxb6 53.
Qa1 Qd6 54. Ne4 Rb1+ 55. Qxb1 Qxa3 56. Qb8+ Kg7 57. Qe5+ Kg8 58. Qg5 .

<53. Qxb6 Rxb6 54. Ra4 g5 55. f4 Rb3 56. Ne2 Re3 57. Ng1> 1-0

Black resigns in the face of nothing but losing possibilities, such as 57...gxf4 58. Rxf4 e5 59. Rxh4 f6 60. Nf3 Kf7 61. Kg1 Ra3 62. Re4 1-0