In all phases of a helpmate in two or more moves, all moves are made by the same pieces in the same order, and pieces of each side must be of a different kind.
The theme was proposed by Abdelaziz Onkoud for the 5th Azemmour TT in 2017.
External link: Award-Dresde-2017.pdf.
Alias: Skewer theme.
Predrag, Nikola
Udovčić, Branko
Azemmour TT-5, Dresden, 2017
1st-2nd Prize
1.Sd7
Sxc6
2.Qf5
Kb2
3.Re5
fxe5+
4.Ke6
Bb3#
1.Sf7
Se6
2.Qh5
Kb1
3.Rg5
fxg5+
4.Kg6
Bc2#
Chepizhny, Viktor
Yasinovataya TT-6, 2002
Spec. Prize
1.Ke4
Bb6
2.Qe5
Sd2#
1.Kg4
Be1
2.Qg5
Sh2#
1.Kg6
Bd2
2.Qg7
Sh4#
1.Ke6
Bc7
2.Qe7
Sd4#
Roland, Marcos
5th Azemmour TT, Dresden, 2017
5th Prize
1.Qd3+
Rxd3+
2.Kc6
Bxf2
3.Bb5
Kf5#
1.Qe3+
Rxe3
2.Ke6
Bg3
3.Bd7
Kd3#