[Event "Sarajevo"] [Site "?"] [Round "0"] [White "Petrosian"] [Black "Hort"] [Result "1-0"] [ECO "A04"] [Opening "Reti: 1...c5, Nimzowitsch-Larsen"] 1. Nf3 c5 2. b3 d5 3. e3 Nf6 4. Bb2 e6 5. c4 Nc6 6. cxd5 exd5 7. Be2 Be7 8. O-O O-O 9. d4 {We have transposed into a Tarrasch Defense, which usually involves active piece play for Black but a better pawn structure for White.} 9... Bg4 10. dxc5 {Black's choice of opening involves accepting an isolated d-pawn.} 10... Bxc5 11. Nc3 Rc8 12. Rc1 Be7 13. Nd4 {As Aron Nimzovitch showed there are three steps to playing against the isolated pawn: Blockade, attack, destroy.} 13... Bxe2 14. Ncxe2 {White has the d-pawn firmly blockaded.} 14... Qd7 15. Nf4 Rfd8 16. Qd3 Ne4 17. Nxc6 {White exchanges one advantage for another. Black no longer has to worry about an isolated pawn, but the pawn which will land on c6 will be a new target.} 17... bxc6 18. Rc2 { Preparing to double rooks, bringing more pressure against Black's weak c- pawn. } 18... Bf8 19. Rfc1 Qb7 20. Qe2 Re8 21. Qg4 { Practically forcing Black to weaken his kingside due to the threat of 22. Nh5.} 21... g6 22. Qd1 { A new weakness has arisen in the Black camp, namely the a1-h8 diagonal.} 22... Bd6 {Played with the idea of meeting 23. Qd4 with Be5.} 23. Nxd5 Rcd8 { 23...cxd5 24.Rxc8 Rxc8 25.Rxc8+ Qxc8 26.Qd4 f6 27.Qxd5+ Kg7 28.Qxe4 leaves White with a winning material advantage.} 24. Rxc6 Qb8 25. f4 Re6 26. Qd4 { Black resigned due to his material disadvantage. If you don't see a clear winning plan for White after 26...f6 try playing it out against Gambit.} 1-0