In a helpmate in three moves, one black piece makes two moves, and one white piece makes two moves. At least two phases are required. Additional requirements: Pieces making two moves (thematic pieces) must be different in different phases. The remaining pieces, which make one move each, can be the same in both phases, but they must be different from the thematic pieces in the other phase.
Onkoud, Abdelaziz
KobulChess, 2015
1.fxe6
Rd8
2.Rd7
Sc4
3.Rxd4
Rxd4#
1.cxd5
Bc8
2.Bd7
Sg2
3.Bxf5
Bxf5#
FEN: 6K1/5p1r/2p1BP1p/2PRPP2/b2Pk1P1/2P1Np2/8/8
Onkoud, Abdelaziz
M. Kutuzov-270 MT, 2015
2nd Prize
1.Qxc7
Rc8
2.Qxc4
Sxc4
3.Kd1
Sb2#
1.Rxb6
Bc8
2.Rxe6
Sxe6
3.Kf3
Sd4#
FEN: 3qRK2/1rN5/BN2P3/3P4/2P5/1p2P1p1/3pkpp1/4r3
Onkoud, Abdelaziz
Polish Chess Federation, 2020
2nd Prize
1.Rh3
Rxg6
2.Rb3
Sd3
3.Kc3
Rc6#
1.Bd7
Bxg6
2.Ba4
Sc6
3.Kb5
Bd3#
FEN: 8/5p1B/6pR/P2pK1pp/1NkP2b1/8/3p4/2br3r
Jones, Christopher James Austin
The Problemist, 2023
1.Sb3
axb3
2.Kb4
bxc4
3.Kxc4
Se2#
1.Sa4
Sb3
2.cxb3
Rb4
3.bxa2
Rb3#
1.XB 2.AB 2.AY#
1.XY 2.AB 3.AB#