Pinning at f7 :-)

I'm a "starred" player (amnandtony) in Yahoo Chess. Here's one of my games; an isolated Queen Pawn game. As you can see, the idea here is a discovered check with a pin for the Black
Queen against its King. The pin is from f7, the throat of the opponent's!

If we just used Rf5-g5, a discovered attack only, it won't work. Here it required a pin at the opponent's throat also. Thus, it is vital to attack the f7-square and occupy it!