[Event "Candidates"] [Site "?"] [Round "0"] [White "Filip"] [Black "Petrosian"] [Result "0-1"] [ECO "A05"] [Opening "Reti: KIA"] 1. Nf3 Nf6 2. g3 d6 3. Bg2 e5 4. d3 g6 5. O-O Bg7 6. e4 O-O 7. Nbd2 Nbd7 8. a4 a5 9. Nc4 Nc5 10. Be3 Ne6 11. h3 {Played to stop Ng4. 11.Ng5 would also stop Ng4 without weakening White's castled position.} 11... b6 12. Qd2 Ba6 13. b3 Nh5 {White has been playing without a plan and the initiative has passed over to Black, who is preparing for a pawn advance with f5.} 14. c3 Qe7 15. b4 f5 16. exf5 gxf5 17. Ng5 f4 { With this move the game changes from a positional channel to a tactical one.} 18. Nxe6 Qxe6 19. b5 {This is the critical position. If the bishop retreats from a6 White will have time to recover. when attacking, the initiative is the most important thing!} 19... f3 20. bxa6 { 20.Bxf3 Rxf3 21.bxa6 Qxh3 With the threat of Nxg3.} 20... fxg2 21. Kxg2 d5 { The tactics have ended with Black on top because of his center control and White's exposed king.} 22. Na3 Rxa6 23. Qe2 Qg6 24. Kh2 Raa8 25. Nc2 Rae8 26. Rae1 c5 27. Rg1 Nf6 {With all of Black's pieces centralized he is now ready for the central break with d4.} 28. Qd2 d4 29. cxd4 cxd4 30. Bg5 Nd5 31. Rg2 { 31.Re4 would put up more resistance.} 31... Rf3 32. Re4 Nc3 33. Rg4 h5 34. Rh4 Rxd3 35. Qc1 Rd1 36. Qb2 Rb1 {White resigned as he will lose his queen to Bf8.} 0-1