Devastating Rook Pin Along your Opponent's 2nd Rank

 I was reminded of a former chess buddy J.P. Hyltin who resided in Austin Texas and often played in Dallas, Houston, and San Antonio. He once drew with legend Joe Bradford after memorizing Big Joe's Benko Gambit line if I recall and wore a T-Shirt about his pregnant wife's GM candidate fetus. 

He was probably a genius in many regards including his profession in some branch of engineering, but I remember him saying that an overwhelming number of decisive tactics involved exploiting or creating a lethal pin. I also respected his views on the absurd DWI laws in our country where way too many repeat offenders end up killing people never having spend a day behind bars!!! His Austin friend and lawyer Mike Simpson Esquire defended many of those types usually the weekend when the Longhorns played the Sooners. I think  Victor Yaward  and Luis Salinas had strong opinions on vehicular homicide as well.

The following position involves the latter. See if you can figure out the winning move in the following position with White to play:

ICC player Danifrani had just withdrawn his Queen to the f6. Can you see how this move is a losing blunder due to the presence of the White Rook on the c7 square? I missed it in the game, but eventually won on time in a 3 minute no increment time control blitz game.