Most of what I learned is directly from the original tutorial, on Thom Barlow's site ( snk.digibase.ca/k4/ ); a condensed version of which can be found on Andy Klise's site ( www.kungfoomanchu.com/guides/k4.pdf ), but a lot of what I actually do in solves has been worked out through trial and error over the 15 years I've been using this method. It is not a very common method; there are probably only half a dozen people officially using it worldwide; so a lot of the challenge is working how best to adapt it to how you want to solve.