this is a game of mine, i'm playing black
Opponent breaking principles and winning

I've watched a chess-lecture on youtube 2 days ago. It was exactly about that.
The thing is: You need to know how to follow up after you have developed and your opponent hasn't yet.
Actually it's a pretty simple principle once again: Open up the position (mostly by exchanging pawns).
If you don't do that quickly, your opponent will eventually catch up in development and all the advantage you had from your early development is in vain. Behind inpenetratable pawn walls it doesn't really matter that much how developed the position is.
:) I had an aproximate idea , trade pawns.
can you please share with me that video??
I've watched a chess-lecture on youtube 2 days ago. It was exactly about that.
The thing is: You need to know how to follow up after you have developed and your opponent hasn't yet.
Actually it's a pretty simple principle once again: Open up the position (mostly by exchanging pawns).
If you don't do that quickly, your opponent will eventually catch up in development and all the advantage you had from your early development is in vain. Behind inpenetratable pawn walls it doesn't really matter that much how developed the position is.