1.Sb6? threat

          2.Qc4 + Ka5 3.S~/Qa4#

      1...Ka6 2.Qa4 + Kb7 3.Qa8#

      1...Kc5 2.Qc4 + Kd6 3.Qd5#

      1...Ka5 2.Qa4#

    but

      1...Kc6!

  1.Qe7 ! threat

          2.Qc5 +

              2...Ka6 3.Qb6#

              2...Kxa4 3.Qa5#

      1...Kc6 2.Sc3 threat 3.Qc7#

      1...Kxa4 2.Qc5 threat 3.Qa5#

      1...Ka6 2.Qd7 threat 3.Sc5#

      1...Kc4 2.Qc5 + Kd3 3.Qc3#

Star, model mates, 2 flights giving key, active sacrifice