Tactics : Black to Play...carefully

I know that if this was in a blitz game, there would be a very high chance of me failing to play this correctly.

I think its a great problem, where a solution jumps out at you, but when you calculate it, you see the lurking issue that stops your idea and have to re-think.

Well, at least I did. 

My re-appraisal found a better solution, then I had to go through it again as, in my mind, I saw the king on the 'wrong' square, so that solution didn't work either. Except it did, when I adjusted my vision !

Its probably simpler for you...

Black to play