[Event "Rio de Janeiro Interzonal"] [Site "?"] [Round "0"] [White "Petrosian"] [Black "Harandi"] [Result "1-0"] [ECO "E12"] [Opening "Queen's Indian: Petrosian"] 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 exd5 7. Bf4 Bd6 8. Bg3 O-O 9. e3 Ne4 10. Qb3 c6 {10...Re8 11.Bd3 c5 12.dxc5 Nxc5 13.Qc2 when White stands better because of Black's isolated d-pawn.} 11. Bd3 Re8 12. Bxe4 dxe4 13. Ne5 Bxe5 14. dxe5 {Taking back with the pawn is surprising at first, but how is Black going to defend the d-pawn? White also gets a grip on the d6 square.} 14... Nd7 {14...c5 15.Rd1 Qc8 16.Nb5 when Black has no way of preventing the knight from penetrating to d6.} 15. Nxe4 Nxe5 16. Rd1 Qc7 17. Nd6 Ba6 { 17...Re6 18.Nc4 would win material because of the pin on the Black knight.} 18. Nxe8 Rxe8 {Black has lost the exchange and all that remains is for the White king to find a safe home.} 19. f3 { With the idea of making a safe haven for the king.} 19... Qc8 20. Bxe5 Rxe5 21. Kf2 h6 22. Rd2 c5 23. Rhd1 Re8 24. Rd7 c4 25. Qb4 {Black resigned because of his material deficit. If you don't see a winning plan for White try defending it against Gambit.} 1-0