This position (with black to move) is from a Russian tournament ( 3rd round ) in June 2010, the position seen struck an onlooker with the idea that there was a forced mate in two moves ! - a move from black, a reply from white and then followed by a checkmating move by black. and no matter what white does, mate will still happen - thus forced mate.
sadly it was a mirage - but players have to look for these things - and then check them !
Rember it is black to move (sadly the black pawn was on f7 rather than f5 - but in this position can you see the 2 moves ??
scroll down a bit for a hint
answers later Monday afternoon