his position comes from two top Grandmasters, Alexander Morozevich and Anish Giri, with a tactic that was missed last week in round one of the 2012 Biel Chess Festival .

 

   In the position on the right it is White to move. 

 

   Answer below.

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   Here is the complete game:

[Event "Biel Chess Festival"]
[Site "0:11:33-0:13:33"]
[Date "2012.07.23"]
[Round "1"]
[White "Alexander Morozevich"]
[Black "Anish Giri"]
[Result "0-1"]
[ECO "D97"]
[PlyCount "101"]
[EventDate "2012.07.23"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Be6 8.
Qb5 Bd7 9. Qc5 b6 10. Qg5 c5 11. dxc5 Bc6 12. Qh4 bxc5 13. Be2 e6 14. Bg5 h6
15. Bxh6 Nxe4 16. Qf4 Nxc3 17. Bxg7 Kxg7 18. bxc3 Qf6 19. Qe3 Nd7 20. O-O Rab8
21. Rfd1 Rfd8 22. h3 Bd5 23. a4 a5 24. Rab1 Bb3 25. Rd6 Bxa4 26. Ra1 Qe7 27.
Ra6 Bb5 28. Bxb5 Rxb5 29. Ra7 Rdb8 30. Ne5 R8b7 31. Rxb7 Rxb7 32. Rxa5 Qd6 33.
f4 Rb1+ 34. Kh2 Nxe5 35. fxe5 Qd1 36. Qf2 Qh1+ 37. Kg3 Rf1 38. Qxc5 Rd1 39. Qe3
Qf1 40. Kh2 Re1 41. Qd2 Qg1+ 42. Kg3 Re3+ 43. Kf4 g5+ 44. Kg4 Kh6 45. Ra4 Rxe5
46. h4 f6 47. Kf3 Qh2 48. hxg5+ fxg5 49. Re4 Rf5+ 50. Ke3 Qg3+ 51. Kd4 0-1

   You can play through this game here: http://www.chessgames.com/perl/chessgame?gid=1672613

 

   Answer:

 

   Morozevich missed 33.Qh6+! Kxh6 34.Nxf7+ king moves, 35. Nxd6, winning a pawn, and screwing up black's pawn structure, leaving him with 3 isolated pawns.

 

   If 33.Qh6+! Kg8 34. Qh8+! Kxh8 35. Nxf7+ king moves, 35. Nxd6

 

   Happy Tactics!

 

   Your Friend,

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