F-S Serper exchanged pawns on e4 and got the 2 B's in the process. He is remaining true to himself in that he likes the prelates. The thing is, I don't know how active they are going to be as White won't have anything to target. Friedel has made a mate threat, so Serper had to weaken K-side with g6
Bd. 3 Schmidt had traversed the distance to play Nd3 and then two moves later retraced back Ne5. Black's position seems solid enough, just that he needs a real plan for setting up the fort.
Bd. 4 Sinanan has exchanged his white square B for a N that popped into d3. This is going to be a typical kind of KI middlegame with hodling a N on e4, hoping to get in c5 and working to make the Bg7 un important.