Petrosian's mastery at work

Hello everyone.

I would like some help to analyse a game from the great Petrosian.

I already analysed it last year but I guess my patzer level does not allow me to see Petrosian's subtleties.

Could experienced players (if I'm not mistaken, MI pfren is also a Petrosian afficionado) help me with this task?

In particular regarding the change in the pawns structure at move 17.

Thank you in advance for your replies.

PS: Some mistakes appeared on the diagram after a bad .pgn copy/paste. It is (I hope) fixed by now.

Your line with e4 looks pretty interesting, I will have a look at it.

Any insight to share on the Petrosian-Hort game? :)

I would be glad to discuss the 9...Ne4 10.dxc5 Bxc5 11.Nc3 Be6 you mention when I'm back at home (first because I'm sure I have done work on it, especially preparing the endgame).

Could you look at move 17th to deal with Petrosian's choice to go for hanging pawns instead of the isolated pawn and the alternatives? The "why" and "how" from an MI perspective on Petrosian's choices at this moment of the game could be rather interesting.

After checking, it happens  my preparation against it was just several endgames studies given by MI Sherechevski in his famous book Endgame strategy. Several positions are very similar with an isolated d5 pawn and a remaining Black's light square Bishop.

My question about the 17th move remains for anyone who feels able to answer. :)