If 3.Nb1, preparing 4 f3, then 3...f5! with the idea of 4.f3 Nxg3 5.Nxg3 f4+ etc.

Or 4.Bxe4 Bxh3 5.Bxb7 Bxf1 6.Qxf1 f5! , followed by ...f5-f4 with an initiative.

8.Qxb7?! Nd5 9.Bg1 Ra8 , intending ...Rfb8, White is in trouble.

Thanks to his strong knight Black is clearly better.

Attacking White on the light squares before he is able to stabilize by c4-c5.

Black sacrifices a pawn in order to get a grip on the light squares and reduce the power of the bishop on b2.

At this point a draw was agreed.

Forcing a queen exchange that will finish off White's counterplay and help the realization of the extra pawn.

Thanks to his extra pawn Black has a clear advantage.