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b. 231-232

composition: Op. 21, Concerto in F minor, Mvt I

..

In A there are no naturals raising e2 to ein the middle of bar 231 and e1 to e1 two semiquavers later as well as e to at the end of bar 232. All signs were added already in GE1 (→FEEE, →GE2). 

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Inaccuracies in A

b. 233

composition: Op. 21, Concerto in F minor, Mvt I

d in A (→GE), EE & FES

f in FE

..

The logic of the figuration's structure and a comparison with analogous bar 235 point to a Terzverschreibung error of FE. The conclusion finds confirmation in a correction of this note performed in pencil – perhaps with Chopin's hand – in FES.

category imprint: Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , Terzverschreibung error , Annotations in FES

b. 234

composition: Op. 21, Concerto in F minor, Mvt I

..

The flat before ewas added in GE (→FEEE).

category imprint: Differences between sources

issues: GE revisions , Cautionary accidentals

b. 237

composition: Op. 21, Concerto in F minor, Mvt I

..

In the main text we add cautionary flats before the D-d octave.

category imprint: Editorial revisions

b. 237

composition: Op. 21, Concerto in F minor, Mvt I

..

The cautionary natural before G, the 1st semiquaver in the L.H., was added in the proofreading of GE1 (→FEEE, →GE2). According to us, this random addition could have been performed at Chopin's request.

category imprint: Differences between sources

issues: Authentic corrections of GE