Puzzle – Finding the Optimal Move


Composed problem; white to move, find the single next optimal move.

Hey guys, this is the first time I composed a puzzle. I spent more time on this than I should have, more than an hour (including thinking about what makes a puzzle interesting, plus some research about how to post it on a forum, etc.) But it was great fun, and so I thought it would be a shame to not post it!

Remember... you have one chance to move a piece, or the magical warden will put you into prison for eternity...! grin.png   I recommend you – if you do accept the challenge – to think long enough in order to not be surprised by the following move by black! Most players probably will not solve this within a minute. Have fun, and don't give up too quickly! happy.png   


1...Nxc1 is the engine choice, but that's not the heart of the tactic. Better, IMO, would something like 1...Bd6 or 1...Bxc4 and then white would not capture the queen, white would play mate.