Mate in 1

I've examined all possible moves of all possible pieces, but still can't see any mate in 1.

Originally posted by SwissGambit
Kardos/Molnar
[fen]n3kB2/ppp1P2R/RQP1N1Pq/1PPP2bB/4NP1p/2K4P/8/8[/fen]
Mate in 1

Seems straightforward enough. So I'm probably missing something then.

It must be black to move as he couldn't have moved last. Black's men have either not moved (a,b,c pawns), all squares they could have moved from are occupied (N, hP), squares are either occupied or would have resulted in a piece moving from giving check (B,Q) and the king would be in either an illegal double check, or impossible check from the white P on c6 (it couldn't have moved last due to the phalanx of pawns behind it.

After any black move white has an obvious mate.

Nxb6 Nxc7#
axb6 Rxa8#
bxa6/c6 Qb8#
cxb6 Nd6#
Bf6+ Nxf6#
Bxf4 Nxf6#
Qxh5 Ng7#
Qxg6 Bxg6#
Qg7+ Nxg7#
Qxh7 gxh7#
Qxf8 dxf8=Q/R#

Originally posted by Peakite
Seems straightforward enough. So I'm probably missing something then.

It must be black to move as he couldn't have moved last. Black's men have either not moved (a,b,c pawns), all squares they could have moved from are occupied (N, hP), squares are either occupied or would have resulted in a piece moving from giving check (B,Q) and the king would be in ei ...[text shortened]... Nd6#
Bf6+ Nxf6#
Bxf4 Nxf6#
Qxh5 Ng7#
Qxg6 Bxg6#
Qg7+ Nxg7#
Qxh7 gxh7#
Qxf8 dxf8=Q/R#

Very good. You not only proved that Black has the move, but found all eleven (!) mate-in-one's.

Oh. I thought there would be a different base idea...