A move made by a pinned piece (except a pawn) along the pin line without capturing the pinning piece.
See also: Leibovici interference.
Meinking, Dan
U.S. Problem Bulletin, 1993 (v)
1.Rg3
Rf3
2.Qf5
Rxf5
3.Rg2
Rf3#
1.Rf3
Re3
2.Rg3
Rxe6
3.Rg2
Re3#
1.Qg4
Bf5
2.Rd3
Bxd3
3.Qg2
Bf5#
1.Qf5
Be6
2.Qg4
Bxb3
3.Qg2
Be6#
FEN: 8/3B4/2P1q3/8/P6p/Rr5k/4P2n/K7
Tataris, Antonis
Moutecidis, Pavlos N.
H. Colonelli-85 JT, 1982
1st Prize
1.Qa4
Rxc7
2.Rc4
Bxf6#
1.Rf5
Bxf6
2.Qe5
Rxc7#