White and a black Excelsior theme with promotion to knights in a helpmate in 5. So far it has not been achieved without promoted force on the board.
See also: Excelsior.
Rinder, Gerd
Die Schwalbe, 1969
1.g5
c4
2.gxh4
c5
3.h3
c6
4.h2
cxb7
5.h1=S
bxa8=S#
Ettner, Josef
Nojek, Ryszard
Keym, Werner
Die Schwalbe, 2005
1.b5
e4
2.b4
e5
3.bxc3
e6
4.cxd2
e7
5.dxe1=S
e8=S#