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Chess Problem 1987g2c601

BDS

The Problemist, 1987 (version)

1sBB4/2rPP1S1/S1kq2R1/Q1rpp1p1/P7/4p3/s3P1Kb/8

#2
Circe Antipodean

1.Sf5!         (2.Rxd6#)

1...Bg1         2.Qxc5#
1...Bf4         2.Sxb8#
1...Bg3         2.Qxc7#
1...e4          2.Sd4#
1...Qxg6[+wRc2] 2.Qb5#
1...Qf6         2.Rxf6[+bQb2]#
1...Qe6         2.Rxe6#
1...Rxc8[+wBg4] 2.dxc8=Q#
1...Rxd7[+wPh3] 2.Qb6#

If the threat were carried out, because h2 is occupied, the bQ would disappear from the board. But when the bBh2 moves, the move 2.Rxd6[+bQh2] would be illegal self-check. All three moves by that bB, while defending against the threat, occupy a square that blocks the rebirth of a black piece that would otherwise check the wK if it were reborn there. The remaining variations are by-play.

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