I was delighted to discover Harry's published method for the Magic Square and my method are DIFFERENT. It was very possible that Harry - on his own - stumbled on the same patterns I discover and published two years ago.
Both Harry's method and my method do the same thing. But, I believe my method (with my Learning Guide) is easier to learn...and easier to remember and use in the real world. It's currently used by many of the top mentalists I know.
One small point: There are a few combinations in Harry's Method (5,6,9 & 10 and 7,8 11 & 12) that do NOT add up to the "target number".
If you look at my site, you can see these combinations do add up to the "taget number" with my method: http://www.chuckhickok.com./tools.html
Harry knows more about Magic Squares than anyone alive. He was very generous is publishing his method in Genii.
I will sell only 250 copies of my method. 180 copies have been sold already via word of mouth.