Set:

1. - Lc1?/Lxe3? Flight from battery-position
2. Db4+ Tc4 3. Dd2+ Lxd2# retour!

Thematic temptation: 
1. Lg3? thr. like key; gxh5! 

Solution: 

1. Lh2!! selective flight (2. Db4+ Tc4 3. Dc3+!! 'Fluchtopfer' Txc3 4. Tg4+! Kxc5 5. Tc4+! Txc4#; 3. - Kxc3 4. Le5+! Td4
5. Lxd4+! Kxd4#) 
1. - gxh5 (3. - Txc3 4. - ~xg4!)
2. Te5! (3. Sf5+ Kc4 4. Db3+ Txb3# 4. Da2+? Tb3+
5. Dxd2...) 
2. - Tg5! (3. - Txf5!) 
Attention:  
3. Se6+!! 'Fluchtopfer' fxe6 Kd3? 4. Dc2+ Txc2#
4. Db1+? Tc2+ 5. Db5...
Culmination:  
4. Dxc3+! Kxc3 
5. Tc5+!! K~#/Txc5#

2. - Tg3 3. Lxg3 ~ 4. Sf5+ Kc4 5. Db3+
1./2. - Lc1?/Lxe3? 2./3. Db4+... 

A continuously complex "highest-level-challenge". Terrific threatplay, quietly staggered involvement of Rg7, stunning outcomes... 
See also the atypical, unfimiliar set. 

Sharp non-thematic attempt: 

1. c8D? (2. Dd8! ~ 3. Le5+ Kxc5 4. L~+ along the large diagonal; Kc6 5. Dxc3+ Lxc3# and 4. Ld4+ Kc6 5. Tc5+ Txc5#) Tg8? 2. Dd8(!) Txd8 3. Dxc3+ Kxc3 4. Le5+ Td4 5. Lxd4+ Kxd4# 1. - gxh5? 2. Dd8,d7 (3. Le5+, Tg4+) Txg5 3. Dxc3+ Kxc3 4. Le5+(!) Txe5 5. Dd4+ Kxd4#
However: 1. - e1T!/S!  (2. - Txe3!/2. - Lxe3!)

A real highlight! (SJGT)