TCh-SVK Extraliga 2012–13

Here is a nice positional game from TWIC 946 played by GM Zoltan Varga(HUN). Black chooses a QGA sideline and wins seemingly without much effort. Black gives the bishop pair up and then plays against the IQP.

Varga,Zo

Photo chessdom

Straka,Joz(2348)-Varga,Zo(2455)
QGA 3..c6 4.e3 Be6[D21]
TCh-SVK Extraliga 2012–13 Slovakia SVK(3.2),24.11.2012

Position 1
White has just created a weakness with 30.b6. But what is the correct procedure to exploit this?

Black to Play

30.b6