1...Sc2(a) 2.Qxc6#(A)

1...Qh5(b) 2.Bxe6#(B)

1.S4~? (Sf3, Se2) - 2.Rd4#, but: 1...Qh5!(b), 1...c5!(c)

1.Sb5? - 2.Rd4#

1...Sc2(a) 2.Sc3#(C)

1...Qh5(b) 2.Sc7#(D)

1...c5(c)/cxb5 2.Qd6#

but: 1...Rc4!(d)

1.Sf5! - 2.Rd4#

1...Sc2(a)/Rc4(d) 2.Qc4#(E)

1...Qh5(b) 2.Se7#(F)

1...c5(c) 2.Qd6#

1...e5/exf5 2.Bxf7#

Zagoruiko 3x2, Kharkov theme, white correction, active sacrifice, changed function of moves.

After unsound problem by Wirtanen Erkki, 1969 (yacpdb=38520).