An invisible move.

Hello Chess friends,

In chess some moves are far from Obvious even after careful considerations of the position.Such moves that are not 'candidates' when you are looking at the position are generally called as "Invisble moves".I wish to show you an invisible move that i failed to notice and led to my loss in the 2nd Round of the recently concluded Isle of Man pokerstars open 2015.I was playing the eventual winner Pentalya Harikrishna from India and the position on the board was reached after move.