Albertan: Here is some analysis I have done of this game:
Van Der Wiel,J (2511) - Yifan,H (2509) [ECO:B96]
Corus Chess 2007 Wijk aan Zee (3), 15.01.2007
[Analyzed by Albertan and Rybka 2.2]
Opening:Sicilian Defense,Najdorf Variation with 6.Bg5.
The Sicilian Defense.
2.Nf3 d6 3.d4
He tries to get her to exchange pawns on d4 which will reduce her influence in the center of the board.
The most popular continuation,beginning to develop her minor pieces and winning a tempo by attacking his e-pawn.
The lost tempo.
She prevents him from playing a knight or bishop to b5.This move defines the variation of the Sicilian defense being played:it is the Najdorf variation.
He intends to play Qd2, 0-0-0, and a timely Bxf6 to weaken Yifan's kingside, when she often must respond with ...gxf6, which weakens her kingside pawn structure. In return, Black enjoys a useful majority of pawns in the centre.
The main continuation for Black in this position,creating a "little center" with her other pawn which influence key central squares.
Van der Wiel plays the most popular continuation,aggressively attacking. Now he threatens to play e5.
She spends a tempo to place more influence over the e5 square,which prevents him from playing 8.e5.
He gives her the two bishops at the cost of weakening the pawn shield in front of her king.
He creates the threat of 10.fxe6 which would allow him to gain a half-open f-file.
She develops another minor piece,which creates pressure against his knight on d4.In addition this developing move also gains him more influence over central squares. [ Analysis:The only other move I have Black playing in this position in my database is 9...Qc5 ]
The game continued with him playing:
Now she must decide how to recapture on e6. [ Analysis:The only other move my database has White playing in this position is 10.Be2 ]
The only move Black plays in my database in this position. This allows him to gain a three to one central pawn majority.
He completes the development of his minor pieces. [ Analysis:According to my database the move 11.Qh5+ has also been tried in this position.]
She decides to reduce some of the central tension and forces his queen into the center of the board..
Regaining his pawn and forcing her to decide how to deal with the attack against her pawn on f6.
This move is a theoretical novelty for the position, she guards her attacked pawn with her queen. [ Analysis:Prior to this game only the move 12...Qe7 had been played in this position: 12...Qe7 [Event "YUG Cup"] [Site "Herceg Novi"] [Date "1999.??.??"] [Round "?"] [White "Velimirovic, Dragoljub"] [Black "Lajthajm, Borko"] [Result "1/2-1/2"] [ECO "B96"] [WhiteElo "2563"] [BlackElo "2420"] [PlyCount "140"] 12... Be7 13. Bh5+ Kd8 14. e5 fxe5 15. Qg4 Rf8 16. O-O-O Bd7 17. Rhf1 Qc5 18. Rxf8+ Bxf8 19. Ne4 Qe3+ 20. Kb1 Kc7 21. Ng5 Rc8 22. Nxe6+ Kb8 23. Qf5 Qh6 24. Bg4 Re8 25. Qf7 Re7 26. Qxf8+ Qxf8 27. Nxf8 Bxg4 28. Rf1 e4 29. h3 Bc8 30. Kc1 e3 31. Re1 Kc7 32. Nxh7 Rxh7 33. Rxe3 Bd7 34. g4 d5 35. c3 Kd6 36. Rf3 Ke5 37. Kd2 Ke4 38. Re3+ Kf4 39. Rd3 Bb5 40. Rxd5 Rxh3 41. Rd4+ Kg5 42. Kc2 Be2 43. Rb4 Rh7 44. a4 Bxg4 45. Rb6 Rd7 46. Kb3 Kf5 47. Kb4 Ke5 48. Ka5 Rd5+ 49. Kb4 Bc8 50. c4 Rd6 51. Kc5 Rd7 52. b3 Rc7+ 53. Kb4 Be6 54. Ka5 Re7 55. c5 Kd5 56. b4 Bc8 57. Rd6+ Kc4 58. c6 b5 59. Rd8 Bf5 60. axb5 axb5 61. Rd1 Ra7+ 62. Kb6 Ra8 63. Rf1 Rb8+ 64. Ka7 Rc8 65. Rf4+ Kb3 66. Kb7 Be6 67. c7 Re8 68. Rd4 Re7 69. Kc6 Kc3 70. Rf4 Rxc7+ 1/2-1/2]