Try: 1. Bd7 [A] ?+

  But 1. ... Sxd7 [a] ! 

 

Try: 1. Bf7? waiting

 1. ... a5 2. Qb5#

 1. ... Se6 [b] /e4 [a] /b3 [a] /d3 [a]  2. Be8 [C] #

 1. ... Bb2/c1/b4 2. Q(x)b4#

  But 1. ... Sd7 [a] ! 

 

Try: 1. f6? waiting

 1. ... a5 2. Qb5#

 1. ... Sd7 [a] /e4 [a] /b3 [a] /d3 [a]  2. B(x)d7 [A] #

 1. ... Bb2/c1/b4 2. Q(x)b4#

  But 1. ... Sxe6 [b] ! 

 

Solution: 1. Bc8! waiting

 1. ... a5 2. Qb5#

 1. ... Sd7 [a] /e6 [b] /e4 [a] /b3 [a] /d3 [a]  2. B(x)d7 [A] #

 1. ... Bb2/c1/b4 2. Q(x)b4#