1. c4 Nf6 2. Nc3 c6 3. d4 d5 4. cxd5 cxd5 5. Nf3 Nc6 6. Bf4 Bf5 7. e3 Qb6 8. a3 This game was played at the Georgian championship in 1946. In his notes, Petrosian says that 8.a3 was a novelty played two years earlier (!) and he wanted to see how it works. At that time, there were only few chess publications, and it was really hard to obtain theoretical information.
8... e6 On 8... Qxb2 9. Na4 Qc2 10. Qxc2 Bxc2 11. Nc5 White has strong pressure on the Queenside. 11... b6 12. Bb5
9. Bd3 Exchange of light-squared Bishops with this pawn structure is usually a good deal for Black. White wants to castle as soon as possible and prevent possible Qb2-c2, because after e6 has been played, Na4-c5 is not effective anymore - Black can simply take it Bxc5.
9... Bxd3 10. Qxd3 Rc8 11. O-O Na5 Petrosian said that his original plan was b4 and Na4 gaining space on the Queenside. But after Black played 11.. ..Na5, b4 would be met with Nc4 and Black is doing fine. At the same time, the character of the position has changed, Black is postponing Be7 and this leaves him behind with the deveopment. Natural reaction is to try opening the center and attacking the King stuck in the middle of the board.
12. e4! dxe4 12... Qxb2 13. Bd2! with dangerous threats.
13. Nxe4 Nd5 White is threatening d5 in many lines and Black is trying to block that square with his Knight. Be7 could be too slow, for example 13... Be7 14. b4 Nc6 15. Nd6+
14. Bg3 Qb3 b4 was still in the air, so Black is trying to block that advance and suggest Queens trade. White will avoid the exchange because that would significantly reduce his potential of taking advantage from better development.
15. Qd2 Nc4 16. Qg5! Queen goes to the kingisde, not only for attack, but also to hold Black's development.
16... h6 16... f6 17. Qg4 Kf7 18. Neg5+ fxg5 19. Nxg5+
16... Nxb2 17. Rab1
17. Qg4 h5 18. Qg5 Rh6 This is one way to include Rook in the play, but the mobility will be very limited. Main idea is to cover g6 square and prepare f6-Kf7.
19. Rae1! Black King is freezed on the e-file, so White is placing his Rook there. Sacrifice on d5 and double check are in the air.
19... Nxb2 19... f6 20. Qxd5 exd5 21. Nc5+ wins a piece.
20. Nfd2 It is time to advance the f-pawn and open up the King's shelter.
20... Qb5 21. f4 Rg6 22. Qxh5 Rh6 23. Qf3 Qd3 Black is desperately running after Queens exchange but no...
24. Qf2 g6 25. f5! gxf5 26. Qxf5! Qxd4+ 26... exf5 27. Nf6+ Kd8 28. Re8#
27. Kh1 Be7 f7 is lost, if 27... Qg7 28. Qxd5 exd5 29. Nf6+ Kd8 30. Re8#
28. Qxf7+ Kd7 29. Nf3 White Knights are entering with huge force and soon he wins a piece. Game is over.
29... Qh8 30. Be5 Qh7 31. Qxh7 Rxh7 32. Bxb2 Rc2 33. Bd4 Bxa3 34. Ne5+ Kd8 35. Ng5 Rh5 36. Nxe6+ Ke7 37. Nf4 Nxf4 38. Rxf4 1-0