Instinct first ?

My initial focus was around the Queen, ie moving the Be7 to allow check or to capture Ra7 ( as the Bishop is pinned ).

Next I switched to adding an attack on the Bishop via Nd5 or Rxd6 : one easily defended, the other not sensible.

Only then did I return to my instinctive move Ng6+ , and this coupled with my Rook thoughts formed the basis of the solution. 

Further checking, I move and have that pleasant feeling of being correct :) 

White to play after 1... exf