1.Qb5+! Kh4! 2.Qa4+! Qb4!! 3.Q*b4+! Kh3!!

4.B*h2!!  f2 5.Qh4+!! K*h4 6.B*g3+!! K*g3 – model sm

 

6.Bg1? f1Q – model sm

6…Kh3 7.B*f2 gf – model sm

But 6…f1R!

  

6.Kg2? gh! 7.K*h2 f1R!  (7…f1Q – sm)

 

4.Qh4+? K*h4 5.B*h2 gh!

(but no 5…Kh3? 6.B*g3! K*g3 7.Kg1 f2+ 8.Kf1! Kf3 – model sm)

6.K*h2 Kg4! 7.Kg1 Kg3! 8.Kf1 f2!