Unpin/self-pin
In the course of the solution, a piece is first unpinned, then self-pinned again.
See also: Unpin/pin; Self-unpin/pin; Self-unpin/self-pin.
Gadjanski, Borislav
Sahovska kompozicija, Liga Problemista, 1993
1st Place
h#3 3.1... (7+15)
1.Qb2
Rxb2
2.S3e4
Bxc5+
3.Bd4
Rb3#
1.Qxa5
Bxa5
2.Sd3
Rxe5+
3.Se4
Bb6#
1.Bg4
Rxd8
2.Bd4
Rxc3+
3.Sd3
Re8#