[Event "Bled"] [Site "?"] [Round "0"] [White "Petrosian"] [Black "Pachman"] [Result "1-0"] [ECO "A04"] [Opening "Reti: 1...c5"] 1. Nf3 c5 2. g3 Nc6 3. Bg2 g6 4. O-O Bg7 5. d3 e6 6. e4 Nge7 7. Re1 O-O { 7...d6 This should be strongly considered. The idea is to take control of the dark squares.} 8. e5 {Taking advantage of Black's weakened dark squares.} 8... d6 9. exd6 Qxd6 10. Nbd2 Qc7 {10...b6 This would have the advantage of first seeing how White would attack the queen instead of guessing.} 11. Nb3 Nd4 { Although, Black has protected his c-pawn. A better way was 11...b6 preparing to fianchetto the bishop on b7.} 12. Bf4 { A good move which develops a piece with a gain of tempo.} 12... Qb6 13. Ne5 { White has the clever threat of 14. Nc4, attacking the Black queen, followed by 15. Nxc5 winning a pawn.} 13... Nxb3 {13...Bxe5 Stopping White from playing 14. Nc4 would leave Black's kingside weakened after 14.Bxe5 when White would have an advantage due to his more active pieces and Black's weakened dark squares.} 14. Nc4 Qb5 15. axb3 a5 {15...a5 is played with the idea of stopping White's threat of 16. Ra5 winning the c-pawn.} 16. Bd6 { A powerful pin on the Black knight. Which leaves Black's pieces in disarray.} 16... Bf6 17. Qf3 { Once again White finds a way to develop a piece with a gain of tempo.} 17... Kg7 18. Re4 {Petrosian himself later criticized this move.} 18... Rd8 19. Qxf6+ {A very beautiful queen sacrifice that leads to mate.} 19... Kxf6 20. Be5+ Kg5 21. Bg7 { Black resigned. Since he has no way of stopping 22. h4+ Kh5 23. Bf3 mate. 1-0} 21... Rxd3 22. cxd3 Kh5 23. Bf3+ Kg5 24. h4+ Kf5 25. Rf4# 1-0