1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Petrosian system. White aims to make it difficult for Black to play f5 7... a5 8. Bg5 Na6 9. Nd2 h6 10. Be3 Slightly unusual. Normal is Bh4 which keeps the pin and forces Black to play Qe8 to break it. Black is often reluctant to play g5 as once f5 is played there is no pawn recapture. However, Be3 does exert more pressure on the the queenside and c5. 10... Nh7 11. O-O f5 12. f3 f4 13. Bf2 h5 14. a3 Bd7 15. Rb1 Bh6 16. b4 axb4 17. axb4 Rf7 with the idea of sitting behind the g-pawn, also useful for defending the 7th rank. 18. c5 Rg7 19. cxd6 cxd6 20. Nc4 Be8 21. Nb6?! the knight tends to get in the way on b6. Keeping it on c4 allows it to go back to d2 and help out with the defence 21. b5 Nc7 22. Bb6 looks better for White 21... Rb8 22. Qb3 g5 23. Bb5 g4 24. fxg4 hxg4 White's pieces have got in each other's way on the queenside, and is about to face an assault on her King 25. Nc4 Trying to hold back Black with 25. g3 only causes more problems 25... Ng5 26. Nc4 Bxb5 27. Nxb5 Nf3+ 28. Kg2 (28. Kh1 Rh7! 29. Bb6 Qd7 30. Nbxd6 fxg3-/+) 28... Qe8 29. Ncxd6 Qh5 30. Bg1 Qh3+-+ 25. Bxe8 g3! 26. hxg3 fxg3 27. Nc4 Qh4 28. Bxg3 Qxg3 29. Rb2 Bf4-+ 25... g3! 26. Bb6 Qh4 27. h3 Rg6 Just to slow White up a little 28. Bxe8 Rxe8 29. Nb5 29. b5 Ng5! 30. bxa6 f3 31. Rxf3 Nxf3+ 32. gxf3 Qxh3 33. Qb2 g2 winning much as in the game - White's extra piece is no help 29... Bf8 30. Nd2 Ng5 31. Nf3 Nxh3+! 32. gxh3 Qxh3 33. Rb2 Rh6 34. Nh2 34. Nh4 Rxh4 35. Qf3 Rc8!-+ 34... gxh2+ 35. Kf2 Qxb3 35... h1=Q was even simpler 36. Rxb3 h1=Q 37. Rxh1 Rxh1 38. Nc7 Nxc7 39. Bxc7 Rc8 40. Rc3? Rh7 0-1