The First Movement of Chopin's Sonata in B♭ Minor, Op. 35

In almost every edition (and consequently most performances) of Chopin's Sonata in Bb Minor, op. 35, there is a serious error on the first page that makes awkward nonsense of an important moment in the opening movement. The repeat of the exposition begins in the wrong place. A double bar before the beginning of a new and faster tempo in m. 5 is generally decorated on both staves with the two dots that indicate the opening of a section to be played twice. A glance at a photograph of the manuscript in Warsaw' will assure us that these dots are an engraver's embellishment. The mistake was made in two of the early editions. Chopin's works were almost always published simultaneously in three cities, Paris, Berlin, and London, and both the French and German editions are wrong. Unfortunately modern editors rely mostly on these two editions--somewhat irrationally, as Chopin did not like to read proof and