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.

Swapping pieces to facilitate the realization of the extra pawn.

Or 1...f5 2.Nf4 kf7 3.h4! , when 3...Bxh4? fails to 4.Rh1.

Offering more exchanges.

White later converted his extra pawn into a win.