3.Bg2 , declining the bishop exchange, then 3...Qa8 , preparing ...Qa2 and ...Ra8-a3 with strong pressure.
Initiating favourable exchanges in order to install an eternal knight on e5.
Preferable was 1...Bxd7 2.Ne5 Nf6! , followed by ...Be8 and ...Nd7 to challenge the white knight, although 3.Qc3 preparing b3-b4 keeps some advantage.
From now on White is better on the whole board, thanks to his powerful knight.
Initiating favourable exchanges in order to install an eternal knight on e4.