Basel 2013 Rd7,.GM Hansen,E(CAN)

Here is Hansen's rd7 game.

Istratescu,Andrei(2654)-Hansen,Eric(2568)

Old Indian [A53]

Hilton Open 2013 Basel(7.4), 05.01.2013

Position 1

White to Play

13...a6

Position 2
The position is complicated. Both sides are trying to make progress with flank attacks. How should black continue?

Black to Play

27.Rc2