Black to play and win

A game from playchess.com earlier this evening. After four beers my play had deteriorated somewhat and after a dreadful French Defence where I dropped a pawn early on I reached the following position after 34. ... b3 35. a3:

I had 25 seconds left on the clock but found a quick way to finish White off - can you find it?

Bb5???

that my official guess😀

Originally posted by Fat Lady
A game from playchess.com earlier this evening. After four beers my play had deteriorated somewhat and after a dreadful French Defence where I dropped a pawn early on I reached the following position after 34. ... b3 35. a3:
[fen]2B2R1K/1P4P1/3R2pP/5P2/1QbP1q2/Pp1p3p/p7/1r1k2r1 b[/fen]
I had 25 seconds left on the clock but found a quick way to finish White off - can you find it?

Originally posted by artplayer
1. Qxa3+ b2xa3
2. b2+ Ka2
3. b2xc1/N+ Ka1
4. Rb1# Beautiful finish nice job 🙂