Ralf discovered Chuan C. Chang’s Fundamentals of Piano Practice. The book is also available at pianofundamentals.com. To quote the author:

“This web site provides free piano lessons, piano teaching material, and piano tuning instructions. You can learn piano up to 1000 times faster (!) compared to other methods (see Chapter One, IV.5). This is the first book ever written on how to practice at the piano. For hundreds of years, many teachers and other books taught you what techniques to acquire, but that is of little use unless you know how to acquire them quickly, as Mozart, Liszt, etc., did. You can download the entire book free using the links below.”

My last piano lesson was about 13 years ago… I’d really like to start playing again, but for now it’s not feasible to move my piano from my parents’ house to our current home. However, having a piano (or a similar instrument) at home is necessary in order to practise enough. I should really look into buying a used electric piano or something like that.