white Re6 Sd4 Bb5 Kh4
black Qe1 Kd5 Rg3
h#2 Immun(4+3)2 solutions
Immun : a piece cannot be captured (immunity) if its rebirth square, in the Circé sense of the term, is occupied
{}
1.Qe1-a1 Sd4-f5 2.Rg3-c3 Re6-e5 #{}
1.Qe1-f1 Sd4-b3 2.Rg3-d3 Bb5-c4 #
{Diagonal/orthogonal echo between the 2 solutions}
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