Ottawa Winter Open 2012-11

Here is a GM Sambuev game from Rd5 played in a risk taking style.

Sambuev Bator (2700) - Marinkovic Mate (2243) [D11]
2012 Ottawa Winter Open RA Centre (5), 18.11.2012
White took some risks in launching an optimistic kingside attack. The Nf6 is under attack. How should black defend?

Black to Play