Tying the knight on b6 to the defence of the c4-pawn to prevent ...Nc8 and ...b7-b5.

White has a decisive advantage.

Preparing ...b7-b5 in order to advance the queenside majority.

The simplifying attempt 3.axb5 axb5 4.b3? failed to c3!

With White lacking an active plan, Black has no reason to hurry.

Keeping up the pressure on the b2-pawn.

This loses at once.
White should have played 8.b3 although after Qa8+! 9.Kg1 c3 Black would have a clear advantage.

White resigned.

Preparing the advance of the kingside pawn majority.