30-10-2015, 11:38 PM
This must be a favourite puzzle of Geoff's: I remember him demonstrating this in a talk he gave before the prize giving at the Edinburgh Congress some 25 years ago. It is your opponent who is being mated: ie on a central square. I remember Geoff saying that this is a puzzle where inexperienced players seem to be at an advantage, as they make fewer assumptions. Hamish's question is along the right lines....
P.S: I didn't get it at the time either.
P.S: I didn't get it at the time either.