4...b5! seems preferable, followed by ...Kb7 and ...Ra8.

Reinforcing the knight and preparing Qc3, d3-d4 and c4-c5 with a further attack.

Now the breakthrough c4-c5 is inevitable. The game continued

White won.

Initiating a central advance.

An excellent diagonal in the absence of a bishop on g7.

White has a pleasant position.

Gaining some space and enabling a future attack.

This just helps White in opening lines towards the black king. 1...Be6 was safer, preparing to meet 2.g5 by 2...Nd7.