Here, this one is old, but since i found it, its such a pitty to do not share with chess.com community. After all who doesnt want to watch a video and learn how to attack like a GM and devastate hes opponents? All it needs is a couple of minutes...
https://www.youtube.com/watch?v=pkLSij_GWsU
... " Learn to calculate like a GM within four hours watching a DvD " ...
Can we safely assume that you do not know where this example can be found?