Goethart theme
Black (or White in bicolor Goethart theme) closes the line of a black pinned piece allowing White to unpin it indirectly on the mating move (it's always a battery mate). Unlike the Gamage theme where the unpin is direct.
See also: Gamage theme.
Uddgren, Anders
Dunaujvaros JT, Magyar Sakkelet, 1966
1st Prize
h#2 2.1... (6+9)
1.R1b6
Sxg7
2.Bb3
Sc6#
1.R8b2
Sxg6
2.Sb3
Sd4#
Haymann, Jean
feenschach, 1990
2nd Prize
h#2 b) wPc4→d4
(12+7)
a) 1.Qb3
Qb4
2.Kxf3
S5c3#
b) 1.Qd6
Sb4
2.Kxg3
f4#
Bicolor Goethart.
Seider, Shlomo
The Problemist, 1972
1st Prize
h#2 2.1... (9+14)
1.Kc6
d4
2.Be3
Qc2#
1.Kc5
Be6
2.Rf6
Sf5#
Gamage theme, Goethart theme.
Fougiaxis, Charalampos Harry
Sinfonie Scacchistiche, 1984
1st Prize
h#2 2.1... (8+12)
1.Bb3
Rf7
2.Sc4
Sdc3#
1.Rf7
Rb3
2.Sd7
Sdf4#