Tata Steel 2013 Rd3, GM Rapport,R(HUN)

Here is GM Rapport's nice rd 3 win.

Black just rolls down the queenside with two passed pawns.

Ernst,S (2556) - Rapport,R (2621)

Benoni h3/Bd3[A70]

75th Tata Steel GpB Wijk aan Zee NED (3.6), 14.01.2013

Position 1
Everything is going black's way with an extra pawn on the queenside while white has nothing tangible on the kingside. What do you suggest for black?

Black to Play

20.Qh4