Cycle of double pins
There are at least three thematic pieces A, B and C, which are, two in turn, essentially pinned in three phases on mating positions. The pinned pieces appear in cycles AB-BC-CA.
Tikkanen, Tapani
Suomen Shakki, 1985
1st Prize
h#2 3.1... (8+14)
1.Be2
Kh2+
2.Se4
Bxg7#
1.Bf5
Bxf4
2.Qf6
Kxg1#
1.Qxe5
Kxg1+
2.Sf3+
Bxf3#
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#
Nastran, Janez
Slovenian Championship, 1993
1st Place
h#2 (7+11)
b) wQb6→b8
c) wQb6→g3
a) 1.Qf2
Qxe6+
2.Sxe6
Rxf2#
b) 1.Qd7
Qxe5+
2.Rxe5
Bxd7#
c) 1.Qd5
Qxf4+
2.Bxf4
Rxd5#