In duplex problems there is another solution, where the white plays first and helps the black to give mate. Cooperation in the fullest.
Nikos Pergialis is the last rebetis (creator - singer of rebetiko songs) and he likes to write verses for his chess compositions!
(Black plays first) 1.Re8 g8=Q 2.Re1 Qg2#
(White plays first) 1.Kh2 Rxg7 2.Kh1 Rh7#
TypeWenigsteiner (up to 4 pieces), Ideal mates.
Ime trel'os ki ap'itharhos, m'agkes mou, ti na g'ini. (I am crazy and undisclipinary - dudes, that's it).
'Ezisa ke pol'emisa gia ti Dikeoss'ini. (I lived and fought - for Justice).
'Ama ti vr'ite, oh ti th'ama, st'ilte se m'ena 'ena gr'ama! (If you find Justice, what a miracle, send a letter to me!)
(Black plays first) 1.Kf5 f4 2.Bf3 Kxf3 3.Bf6 e4#
(White plays first) 1.f4+ Kxd5 2.f5 Bh4+ 3.Kf4 g5#
Nikos Pergialis - Emmanuel Manolas
(Black plays first) 1.Bc3 Sf2 2.Bb4 Be2#
(White plays first) 1.Sh2 Be5 2.Sf3 Re2#
Both mates are given from square e2. The white Knight closes the lines of the pieces guarding e2 (in one case the bRg2, in the other case the wBh5). Self-blocks.
M'ages, aft'o to pr'ovlima - mi sas provlimat'izi! (Dudes, this problem - must not puzzle you!)
'Enas ips'oni ta lefk'a - ki o 'idios ta grem'izi (Someone uprises the white - the same brings them down!)
M'esa sti m'oda t alog'aki - f'enete p'ire fakel'aki! (Fashionable the knight - it seems he has received a bribe!)