1.Sc7?
1...Kc8 2.Qh8+ Kd7 3.Qe8#
  2...Kb7 3.Qa8#
1...Kc6 2.Qe4+ Kd7 3.Qe8#
  2...Kc5/d5 3.Qxd5#
    but 1...d5!
  1.Qd8+? Ke6 2.Qxd6+ Kf5 3.Qf6#
    but 1...Kc6!
  1.Qh3+?/Qg4+? Ke7/Kxe8 2.Qf5 ~ 3.Qf7#
     but 1...Kc6!
  1.Qh7+? Ke6 2.Qf7+ Ke5 3.Bc3#
    but 1...Kc6!
  1.Qc4? Ke7/Kxe8 2.Qf7#
    but 1...d5!

  1.Qb4! threat (1...d5/Ke7) 2.Qxd6+
  2...Kc8 3.Qc7#
  2...Kxe8 3.Qd8#
1...Kc6 2.Sf6 d5 3.Qb6#
1...Kc8 2.Qb5 d5 3.Sd6#
1...Kxe8 2.Qb7 d5/Kf8 3.Qf7#
1...Ke6 2.Qxd6+ Kf5 3.Qf6#

Star, model mates, flight giving key, passive sacrifice.