Any ideas for this interesting problem? Any ideas for this interesting problem?
The black king threatens to escape via e4, so

8/2Q5/8/3k2K1/8/8/4NP2/8 w - - 3 13

1. f3 Ke6 {(forced)}
2. Nf4#


(sidenote: I'm really divided into putting the solution in a 'spoiler' block with &gt;! (as is customary on Puzzles.SE)


   like this


and the current way, with a diagram to allow playback. It would be very nice if we could put the diagram inside the spoiler.)