King's Indian Killer - The Harry Attack

Do you want a simple and practical method to counter Black's kingside fianchetto defences after 1 d4? A line that takes the initiative from a very early stage and creates difficult practical problems? If so, then The Harry Attack (1 d4 Nf6 2 c4 g6 3 h4!) is for you.

At first this looks like some sort of joke or, at the very least, a weird outlandish line. Aren't we all taught to focus on development and control of the centre in the early stages? What's 3 h4 got to do with that?

Perhaps surpri...