How to beat a Grandmaster (or two)

Your WWWednesday post, a day early:

Gannon has taken an interest in chess, and we play at home almost every evening. As a result, I've been reading chess stuff on the net. Thought this video was interesting. See if you can figure out "how he does it" before he tells us at the end.

One note: There is one 'swear word' early in the video, so preview this sans children.