A chess puzzle I made a while back

It is Black to move and win. The puzzle is a 9-move sequence. 
Sorry if this looks a bit funky; this is my first time making an announcement. I made this puzzle a while ago by now and I originally just shared it with a few family members and friends. But I decided now to show it here too.

Just write the answer in the comments if you want to and can find it (without using the engine obviously). : )