Self-unpin/pin
In the course of the solution, a piece is first self-unpinned, then pinned again.
See also: Self-unpin/self-pin; Unpin/pin; Unpin/self-pin.
Haymann, Jean
Haproblemai, TT, 1985
Spec. Prize
h#2 (6+12)
b) wBa1→a5
c) wBa1→h2
a) 1.Kc2
Qc8
2.Bb6
Rxb2#
b) 1.Ke2
Rxe5
2.c2
Qg4#
c) 1.Ke4
Rb4
2.Sf5
Rxe5#