Rascan 123 lesson

The 23th of January Rascian gaves a lesson on Playchess ,here is the text of the lesson(Comments by rascian )Thx a lot to him
Los Angeles"1963
[White "Gligoric"]
[Black "Petrosian"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3
d6
This is very old kind of opening.  Today you can't see a much of a games
like this one
9. h3
Taking a good square,but this pawn move weak a white's kingside.
Nb8 10. d4
Realising a square for a Knight and taking controll of the center.
Nbd7
Black continues with his plan.
11. c4 c6
Other possible move is Bb7,but it'sproven in high level games that c6 response is better
12. c5
I think that in a time when this game was played this was a novelty,but once again I must
say that I'm not 100% sure
Qc7 13. cxd6
It's only possible move for White,or other variations will bring a positonal advantage for black. (13. Be3 dxc5 14.dxc5 Nxe4 {Bb7 or c5 preparing pressure on  kingside diagonal}) 
13... Bxd6 14.Bg5 exd4 15. Bxf6 gxf6
What do you think...who is standing better here and why? (15... Nxf6 16. e5
Bb4 17. exf6 Bxe1 18. Qxe1 c5 19. fxg7 Kxg7 20. Bd5 Ra7 21. Qd2 Qd6 22. Be4 Re7
23. Qg5+ Kh8 24. Nbd2 Rfe8 25. Rc1 Bxh3
16. Nxd4
16. Qxd4 Be5 (16... Re8 17.Nc3 c5 18. Qd2 c4 19. Bc2 Bb7 20. Rad1 Bf4 (20... Re6)
16... Nc5 17. Nf5
Pressuring best Black's figure
Bxf5 
That's why Black accept exchange and gives a lightsquare Bishop
18. exf5 Rad8
Taking d file
19. Qh5
Questonable move.All variations you could see bellow:
1)19. Nd2 Bh2+ 20. Kf1 Nd3 21. Re4 Qa7 (21... Rfe8 22. Qg4+) 22. Qe2 Nf4 23.
Qg4+ Kh8 24. Nf3)
2)19. Qg4+ Kh8 20. Nc3 Nd3 21. Qh4 Be7 (21... Be5 22. f4) 22.
g3 Nxe1 23. Rxe1 Rfe8 24. Ne4 Qe7 25. f4 Bxb2) 22... Nxf4
19... Be5 20. Nc3 Rd4
20... Rfe8 21. Rad1 b4 22. Qg4+ Kh8 23. Qxb4 (23. Rxd8 Rxd8 24. Rd1 bxc3)
23... Nd3
21. Re3
21. Rad1 Rb4 (21... Nxb3 22. axb3 Rfd8 23. Rxd4 Rxd4 24.Ne4 Qe7 25. Qh6 (25. Nc3) (25. Qh4 Qb4 26. f4 Rxe4 27. Rxe4 Qxe4) 25... Rxe4 26. Rxe4 Bh2+ 27. Kxh2 Qxe4 28. Qxf6 Qf4+) 22. Re3 Nxb3 23. axb3 Rxb3 24. Nd5 (24. Re4 Bf4 (24... Bxc3 25. bxc3)) 24... cxd5 25. Rxb3
21... Bf4 22. Re2
22.Qg4+ Kh8 23. Rg3 Bxg3 24. Qxd4 Bh2+ 25. Kh1 Qe5 26. g3 (26. Qxe5 Bxe5 27. Rd1
Nxb3 28. axb3 a5) 26... Qxd4
22... Bd2
22... b4 23. Na4 Nxb3 24. axb3 Rfd8 25. Ree1 (25. Rae1 Rd1 26. g3 Rxe1+ 27. Rxe1 Be5) 25... c5
23. Nd1
23. Bc2 Rfd8)
23... Bg5 24. g3 Qd6 25. Ne3
{I think this is a critical position but black has  a slight positional advantage!
Bxe3 26. Rxe3 Kg7 27. Bc2 Qd5 28. a3 Rd2 29. Qg4+ Kh8 30. Rd1 Rxd1+ 31. Qxd1 Qxd1+ 32. Bxd1 Rd8 33. Bf3 Rd3 34. Re8+Kg7 35. Bxc6 Rb3 36. Re7 Rxb2 37. Bd5 Kh6 38. Bxf7 Kg5 39. Be6 Nxe6 40. fxe6Kf5 41. Rxh7 Kxe6 42. Ra7 Ra2 43. Rxa6+ 1-0