My father was a very good amateur pianist, and he had a collection of books on technique. One of the things he had was a small volume of exercises by Rudolf Ganz, in which Ganz mentions the pedagogical work of the Swiss composer, Émile-Robert Blanchet, who wrote a ton of polyphonic exercises for one-hand. These exercises were a great help for finger independence, which I acquired early on. This might have given me somewhat of an edge, a facility to be able to knock any obstacle that was in my way.