1. Sxe3? (2. S~+) Sb2+ 2. Sd1+ Sxd3!

Thematic:
1. Le7?/Lxf8? (2. Sd4+ Kf4 3. Se2+! Kf3 4. Dxe3+ Sxe3#)
1. - gxh4!
1. Sxf8? (2. Se5+ Kf4 3. Sc4+! Kf3 4. Dxe3+, slow 2. Le6 ~
3. Txf2+ Sxf2#) Da3!

1. b4! flight (2. De2+ Ke4 3. Dc4+! Kf3 [Lxc4?] 4. Txf2+! exf2 5. De2+ retour! Lxe2#; 3. - Kf5 4. Dd3+ retour; Lxd3#) It does not threaten (2. Sxf8), because of 2. - gxf6! 3. Se5+ fxe5!
3. Le6? f5! 4. Lxf5 Lxd3+! 5. Lxd3... 3. Sd7? Tb1! 4. Sxf6
(5. Txf2+, De2+) c1S!! 5. De2+ Sxe2!
1. - Txg8, mainplay (3. - Kf5 4. - Kxe6!)
2. Le7? gxh4!
2. Lxf8! → selective flight (3. Sd4+) gxh4 (4. - Kg5!)
Uplifting finale:
3. Sg5+! → selective check; Sd4+? Kf4
4. Ld6+ retour! Lxd6??
4. - Kxg5(!) 
5. Db5+!! Lxb5#
6. Lc4??! 
6. Sxb5/Se2??

1. - Lc4 → selective flight (3. Dxc4?)
2. Sxf8! with the decisively(!) new primary threat
(3. Ld5+, deflection/Ablenkung! Lxd5 4. Dxe3+) gxf6?
2. - Txg8, best, reducing to  
3. Se5+ Kf4
4. Sxc4+ Kf3
5. Dxe3+ Sxe3#

Complex [flightspecific] battle around a pinned white queen. Thematic choices, switchbacks, motive inversion, etc. etc.  

Schrecklich schwer und schön! Erinnert mich irgendwie an Bruckners achte Symphonie (Werner Schmoll)