[Event "ct"] [Site "Zurich"] [Round "0"] [White "Szabo"] [Black "Petrosian"] [Result "0-1"] [ECO "E00"] [Opening "Queen's Pawn: Neo-Indian"] {How White can maintain the initiative against Black's blockaded security} 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 b6 8. Bd3 Bb7 9. O-O Nbd7 10. Rc1 c5 11. Qe2 a6 12. cxd5 exd5 13. dxc5 bxc5 14. Rfd1 Re8 15. Bc2 {The bishop is going to b3, virtually forcing Black to play c4 and accept what Nimzowitsch called a blockaded security. The only question is whether this security is really secure} 15... Qb6 16. Bb3 c4 17. Ba4 Bc6 18. Bxc6 Qxc6 19. b3 {This is the normal way of attacking the hanging pawns} (19. Nd4) 19... Rac8 20. Na4 $2 { Beating the air; this only induces the Black Queen to improve her position} ( 20. bxc4 dxc4 21. Nd4) 20... Qb5 21. Nc3 Qa5 22. Bxf6 {This exchange suits White's strategy, relieving him from the necessity of constantly watching the threat ... Nc5-d3} 22... Nxf6 23. bxc4 dxc4 {Black's hanging pawns have now disappeared, and he is left instead with an isolated, but passed c-pawn. This pawn may be either strong or weak. There is no general rule about this, for even the slight modification of the position may alter the result completely. In the present case, the pawn is weak, and White could win it in several ways} (23... Rxc4 24. Nxd5 $1 {In between move tactic}) 24. Nd2 $2 { This is not the way to go about it} (24. Rd4 Bb4 25. Rxc4 Bxc3 26. R1xc3 Qxc3 27. Rxc3 Rxc3 {Black has little to fear. With two Rooks against a Queen and pawn, he can face the future with equanimity}) 24... Rc6 25. Nxc4 $2 { A decisive mistake: White now gets into a deadly pin} 25... Qc7 26. Na4 Rc8 27. Rd4 (27. Nab2 Ba3 {removing the guard}) (27. Nab6 Rxb6 28. Nxb6 Qxc1 29. Nxc8 Qxc8 30. e4 {drawing chances}) 27... Ne8 28. e4 Bf6 29. e5 Bxe5 30. Re4 Nf6 $1 {the point} 31. Nab6 (31. Rxe5 Rxc4 32. Rxc4 Qxc4 33. Qd1 Qxa4 $1 34. Qxa4 Rc1+ ) 31... Rxb6 32. Rxe5 Rc6 (32... Qxc4 33. Rxc4 Rb1+ $19) 33. Re7 Rxc4 34. Re1 Qc6 35. h3 Rc1 36. Rxc1 Qxc1+ 37. Kh2 Qc4 38. Qf3 Qxa2 39. Ra7 Qd5 0-1