Chernous theme
A black line-piece B gives a check, either directly or as the rear piece of a battery. A white piece W self-pins by interfering on the check-line. W is then directly unpinned by move of B, which eventually makes a self-block. W delivers mate.
Chornous, Volodimir
Meinking, Dan
harmonie, 1998
5th HM
h#3 2.1... (4+8)
1.Reg6
Sd2
2.Qd1+
Sb3
3.Qg4
Sd4#
1.Rgg6
Sde5
2.Qd4+
Sc4
3.Qf6
Se3#
Paliulionis, Viktoras
Match Latvia-Lithuania-Leningrad, 1986
1st-2nd Prize
h#2 b) -wSb4
(5+2)
a) 1.Qc5+
Sd5
2.Qa3
Sb6#
b) 1.Qe3+
Be4
2.Qa3
Bc6#