Preferable was 2.g3 f5 3.Bg2 e5 with just a slight black edge – Dolmatov.

Now these two pawns control considerable space, and they can prove useful in a future kingside attack.

Intending to deploy the bishop on the h1-a8 diagonal, which was weakened by g2-g3.

Having a clear extra piece, Black won just a few moves later.

Preparing ...b7-b5 in order to undermine White's pawn majority.

Heading for f4(-d3).

Preventing the ...Nf4-d3 maneuver in advance, but now Black reverts to his first plan with great effect.
4.g3 was better, with just a slight disadvantage after g6 followed by ...Bg7 – Serper.

Fixing the queenside and enabling ...Bb5.

Black has a more pleasant game.