[Event "Havana Olympiad"] [Site "?"] [Round "0"] [White "Petrosian"] [Black "Johansson"] [Result "1-0"] [ECO "B90"] [Opening "Sicilian: Najdorf"] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. f4 Nc6 8. Be3 Qc7 9. O-O Bd7 10. Nb3 b5 {A typical position in the Sicilian Defense. Black attacks on the queenside and White operates on the kingside and in the center.} 11. a3 Be7 12. Rf2 b4 13. axb4 { 13.Na4 Nxe4 14.Nb6 Rb8 15.Rf3 Rxb6 16.Bxb6 Qxb6+ 17.Kh1 Nf2+ 18.Rxf2 Qxf2} 13... Nxb4 14. Bf3 Rc8 {Black continues to ignore the safety of the king.} 15. g4 h6 {This pawn thrust just gives White a target to attack. Better was O-O.} 16. g5 hxg5 17. fxg5 Nh7 18. Qd2 Nf8 { Black's pieces lack coordination due to his king being stuck in the center.} 19. Qd4 {The double attack on Black's knight and g-pawn nets White material.} 19... Nc6 20. Qxg7 Rh7 21. Qg8 Ne5 22. Be2 Bc6 23. Rxa6 { White has the initiative on the whole board.} 23... Rd8 { Now White wins with a nice combination.} 24. Rxc6 { This exchange sacrifice ends the game quickly.} 24... Nxc6 25. Bb5 {Black resig ned as he has no good response to White's many threats. If you don't see the threats try defending against Gambit.} 1-0