Try: 1. Qf7? waiting

 1. ... Se7~ 2. b4#

  But 1. ... Sd5!

Try: 1. b4? ad lib 2. Bc4#

  But 1. ... axb4!

Try: 1. Sc4? waiting

   But 1. ... Kxb3!

Try: 1. Rb1? ad lib 2. Sc3#

  But 1. ... Sd5!

Try: 1. Bc4? ad lib 2. b4#

  But 1. ... f1=Q! f1=B!

Solution: 1. Sb1! waiting

 1. ... Se7~ 2. Qxa3#

 1. ... Ka1 2. Sbc3#

 1. ... Kxb3 2. Bc4#