Congrats to @juanmi96 as winner of this round!
Here is the complete solution:

1. Nc3!

a)

1. ... Bxc3
2. Bd3+ b5
3. axb6 en passant # (checkmate)

b)

1. ... Ne5 (covers d3)
2. Bc8 Bxc3
3. Rd5! c1Q
4. Bxb7# (checkmate)

c)

1. ... c1N (the best black try, covers d3)
2. Be6! (threatens Bc4#) Ne5 (covers c4, but prevents its own bishop to give check at e5 later)
3. Bc8 Bxc3
4. Rd5 (prevents blacks king to escape via b5) Bxb4
5. Bxb7# (checkmate)