My streak of four wins (3 in the current tournament) ended yesterday with a loss to an expert,  here is the game. All was wrong that day – I made a mistake defining my possible opponent as 2300+ master and was a bit nervous,  then I thought that I got too high in the table and somebody gonna stop me,  my preparation against the master (Sicilian, Rossolimo) went into garbage because I  got French from different guy (who didn’t play it before in the club,  so I wouldn’t guess right anyway) and in my usual French, Tarrasch I got Morozevich variation – 1.e4 e6 2. d4 d5 3. Nd2 Be7,  a fashionable line among top GMs in recent years. To my shame I was completely unfamiliar with it.
I played this game like my recent opponents – losing a pawn in the opening, making moves worsening the position, giving up two bishops, etc.
He eventually got strong pawns in the center and his pieces attacked me on the kingside.  I couldn’t get any counterplay and my only hope was time,  I had twice more.  But he started to play faster and finished me off with ~10 minutes remaining on his clock.
The guy was very nice after the game and tried to find some counterplay for me (he pointed to slow moves Rb1 and b3, and stressed the necessity of playing Ne5 at the right moment, blocking the pawn e6 or forcing the exchange of the dark-colored bishop and weakening the kingside).
Anyway, we learn from our mistakes and move on.