Gamage theme
Black (or White in bicolor Gamage theme) closes the line of a black pinned piece allowing White to unpin it directly on the mating move (by white pinning piece). Unlike the Gothart theme where the unpin is indirect.
See also: Goethart theme.
Abdurahmanović, Fadil
Probleemblad, Dutch Association of Chess Problem Friends-60 JT, 1991
1st Prize
h#2 2.1... (6+10)
1.Sd4
Rb8+
2.Kc7
Qf4#
1.e5
Rd8
2.Kc6
Qh6#
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.