Helsinki theme
A black piece sacrifices itself to a white pawn to enable it to vacate a square for a black pawn which, in turn, vacates a square for the black king.
Zajic, Helmut
Schach-Report, 1995
1st HM
h#3 b) wBa5→g1
(6+13)
a) 1.Qc6
dxc6
2.d5
d4+
3.Kd6
Rxh6#
b) 1.Rg4
fxg4
2.f3
Rg8
3.Kf4
Bh2#
Zajic, Helmut
Rochade Europa, 2003
h#5 (4+5)
1.Qg6
Kb7
2.f4
Kc6
3.Qe4+
fxe4
4.f3
Kd5
5.Kf4
Bd2#
Arnold, Randolf
Schach-Aktiv, H. Zajic-70 JT, 2005
1st Prize
h#4.5 (4+8)
1...Re5
2.Ba5
bxa5
3.b4+
Re2
4.Kb5
Rd2
5.Sc6
Rd5#