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Problem Observer, 1998

#2
Circe

1.Qg2        ()

1...Rxf2     2.Bf3#
1...Bxc2     2.Qf3#
1...Sh3, Sf3 2.Sc3#
1...dxc2     2.Bd3#
1...f3, fxg3 2.Sf4#

In the first three variations White can mate because Black has just vacated a rebirth square such that if the mating piece is captured it would get reborn still checking the black king. In the final two variations White mates by occupying a square just vacated by a pawn. Before the pawn moved the white move would have been illegal because of self-check, the captured pawn being reborn checking the white king.