white king f6...black king h8
white to move...Kg6 mate...
white king f6...black king h8
white to move...Kg6 mate...
Your theme is sound, but a blocking 1...Qf6 forces a 2nd move. I confess, I see worse problems in the other corners so I am stumped.
edit, sorry didn't see raindancer had responded while I was writing
Rainxdancer,
OK, then clarify, is this a legitimate puzzle? What is the source? Is it something you made up just wondering if it is possible? etc?
Can you add the two kings to the position, so that white to move, can checkmate black in one move?