Originally posted by heinzkatHeinzkat, sorry for not seeing a mate in 1,
The construction stands on the shoulders of this composition by Sam Loyd (Boston Gazette 1859):
[fen]2brrb2/8/p7/7Q/1p1kpPp1/1P1pN1K1/3P4/8 w - -[/fen]
#2
Solution: [hidden]1. Qa5[/hidden]
The Rook/Bishop moves all interrupt a line of another piece, allowing the checkmate on move 2.
but after Qa5, Bc5 I don't see the mate.
All other moves are clear.
But after Bc5, where is the mate?