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I composed this position, with White to move. White has a huge variety of mates in one, and some more in a few more moves. There are two worst-possible moves, which force Black to mate White in three.
Interrobang
Black is not forced to mate White because he has other options following the double check (e.g., 2...Nxd4+, 2...Rxe7, 2...h5, 2...Qb2, etc.), and even after the text he still has 3...Rxe3+, 3...Ncxe3, and 3...Ndxe3.
WindowsEnthusiast
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