Chess Puzzle (17)

Try find the best move for black. If you want to test your tactical ability, try it on your own first before asking for assistance... especially from your chess computer program.

The position below arise  from one of my recent Internet Chess Club(ICC) blitz ( 15 minute) game. Although i was down in material, my piece is all working with full cylinder. Furthermore, white`s king is doing a `dangerous  walk in the park!

Siddharta-Hairulov

Internet Chess Club (ICC) 27.2.2010

Black to move and win!