Who invented the Circles program of tactical study?
Michael de la Maza, whose USCF rating went up over 600 points in two years while working through the Circles. He wrote about the method in two articles (here and here), and then expanded them into a book Rapid Chess Improvement. Note that the book contains very little information that is not already in the articles. The general idea, that to improve at tactics it helps to learn a large set of basic tactical positions extremely well, has been independently suggested by many chess instructors.
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