[Event "Amsterdam"]
[Site "Amsterdam NED"]
[Date "2001.??.??"]
[Round "8"]
[White "Tregubov, Pavel"]
[Black "Sutovsky, Emil"]
[Result "0-1"]
[Annotator "Hathaway, Mark"]
[BlackElo "2651"]
[ECO "D72"]
[WhiteElo "2617"]

1. d4 Nf6 2. c4 g6 ( 2... c5 ) ( 2... e6 ) 3. g3 ( 3. Nc3 ) 3... Bg7 4. Bg2 d5 { This opening (Fianchetto Variation of the Gruenfeld Defense) has been successful for Black over the years, despite the fact that Bg2 isn't terribly blocked by a strong Black pawn center (such as Pe6, Pd5, Pc6) . } 5. cxd5 Nxd5 6. e4 { Whichever way White chases Nd5 it will retreat to expose Pd4 to an attack. Black also hopes/plans to utilize queen-side light squares which Bg2 can't contest. } 6... Nb6 7. Ne2 c5 { I think this is a little unusual, despite the move being common in most all other Gruenfeld Defense variations. } ( 7... Nc6 ) ( 7... O-O ) 8. d5 e6 9. O-O O-O 10. Nbc3 Na6 11. h3 exd5 12. exd5 { White would like to cramp Black's pieces, but the one pawn at d5 can't do much damage by itself. } 12... Nc4 { Though this is a square which is nearly always in White's hands it is easily utilized by Black. } 13. b3 Nd6 { Black's position is relatively harmonious and only the passed Pd5 is a problem. That the Pd5 also happens to block Bg2 and Nc3 is a happy "coincidence". } 14. Bf4 b6 $5 ( 14... Nc7 15. Bxd6 Qxd6 16. Ne4 Qxd5 $5 ( 16... Qb6 $2 17. Rc1 ) 17. Nf6+ Bxf6 18. Bxd5 Rd8 19. Nf4 g5 20. Qf3 Bxa1 21. Rxa1 gxf4 22. Bxb7 Rb8 23. Bxc8 Rdxc8 24. Qxf4 ) 15. Qd2 Re8 { This fights for control of e4 and eyes Ne2, but it also avoids Bf4-h6xg7, which would weaken Kg8. } 16. Rad1 Bb7 { Black develops modestly to catch up on piece activity, before embarking on any offensive measures. } 17. h4 Qd7 18. Kh2 Nf5 { It's hard to prove this is wrong, but it just seems to me that improving Na6-c7 first would be more valuable. Walking into the pin (after Bg2-h3) is unpleasant. } ( 18... Nb5 19. Nxb5 Qxb5 20. Nc3 Qd7 ) ( 18... Nc7 19. Bxd6 Qxd6 20. Ne4 Qd7 21. d6 Nb5 ) 19. Bh3 { This serves a defensive purpose and weakens Pd5, but mostly it indicates White's position doesn't offer any easy straight-forward way to proceed offensively. Black has more flexibility. } 19... Nb4 20. Rfe1 ( { The obvious forcing variation: } 20. a3 Nxd5 21. Nxd5 Bxd5 22. Qxd5 Qxd5 23. Rxd5 Rxe2 24. Bxf5 gxf5 25. Rxf5 Rd8 ) 20... Rad8 21. Bg5 f6 22. Be3 ( 22. Bf4 ) 22... Qc8 23. Nf4 { White's centralized rooks and queen back up his probing minor pieces, though it's unclear if he can force a breech in the defense of Kg8. The double threat of attacks on Kg8 and of advancing Pd5 surely gives White the advantage. } 23... Bh6 24. Nh5 Bg7 25. Nxg7 Kxg7 26. Bh6+ Kf7 27. Rxe8 { White trades-off this rook, so he can stay fully behind Pd5 and to try to pull Black's king out into the open. } 27... Kxe8 28. d6 { This seems st a tiny bit premature to me. It frees Bc8 and gives square c6 to Black, for a queen or knight. } ( 28. Bf4 { preparing h4-h5xg6 might weaken Black's king's safety a bit, while positioning the Bf4 to support d5-d6 } ) 28... Kf7 29. Qf4 { This makes Bh6 much worse and only indicates White's impatience. } 29... Qe6 30. Bxf5 gxf5 31. Nb5 Nc6 ( 31... Nd5 ) 32. d7 Rxd7 33. Rxd7+ Qxd7 34. Nd6+ Ke6 35. Nxf5 Ne5 36. Ne3 Kf7 ( 36... Qd3 37. Bg7 Qg6 ) 37. g4 Qc6 { Both go directly for their opponent's king. White might be better in terms of Black's king being further away from the corner, but Qf4 and Bh6 are still terribly uncoordinated: making Bh6 almost useless for the time being. Black's pieces might now have a more unopposed path to the White king. } 38. Bg5 Qf3 39. Bh6 Qc6 40. Kg3 Qh1 41. Qf5 Qg1+ 42. Kh3 Qh1+ 43. Kg3 Be4 $1 44. Qf4 Ng6 45. Qc7+ Ne7 46. Qxa7 $2 ( 46. Qf4 { keeps Pf2 defended, at the cost of leaving Bh6 stuck and offering a nasty tactic to Black! } 46... Nd5 47. Nxd5 Qg2# ) 46... Qf3+ 47. Kh2 f5 { Now White's king will be completely exposed! } 48. gxf5 ( 48. Bg5 Qxf2+ 49. Kh3 fxg4+ 50. Kxg4 ( 50. Nxg4 Qg2# ) 50... Qf3# ) 48... Bb7 49. Qa4 Qh1+ 50. Kg3 Qf3+ 51. Kh2 Qxf2+ 52. Kh3 Qf3+ 53. Kh2 Qh1+ 54. Kg3 Nxf5+ 55. Kf4 ( 55. Nxf5 Qf3+ 56. Kh2 Qg2# ) 55... b5 $1 { White's queen is chased away from square e4, so Black can win a piece or checkmate White's king; being essentially ahead a full piece in that region of the board for a few moves. } ( 55... Nxh6 56. Qd7+ ) 0-1