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b. 212

composition: Op. 12, Variations in B♭ major

..

The last R.H. chord is devoid of accidentals, which results in c2-e()2-f2-a2. This is a patent mistake, as there is no doubt that it is a typical dominant seventh chord in B that should be used here. Both necessary naturals, to the outermost notes (c2 and a2), were added in GE, while in EE only the bottom one.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , Omissions to cancel alteration , GE revisions , Errors repeated in EE

b. 212-214

composition: (Op. 4), Sonata in C minor, Mvt I

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In the main text we add cautionary accidentals to the bass minims at the beginning of bar 212 and 214 –  to B and  to g.

category imprint: Editorial revisions

b. 212-214

composition: (Op. 4), Sonata in C minor, Mvt IV

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In the main text we omit the unjustified flats (cautionary?) to a2 in bar 212, a1 in bar 213 and Ain bar 214, present in all sources. On the other hand, we add a cautionary  to B in bar 214. The latter was also introduced into GE (→FE,EE,IE).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions , Cautionary accidentals

b. 213

composition: Op. 35, Sonata in B♭ minor, Mvt I

No marking in GC (→GE) & FE1 (→FE2EE1)

in FE3 (→FE4) & EE2

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Chopin added the  indication in the proofreading of FE3 (→FE2). It was repeated also in EE2.

category imprint: Differences between sources

issues: EE revisions , Authentic corrections of FE

b. 213

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

Slur & dots in A

No markings in GE (→FEEE)

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The missing slur and dots, marking the articulation of the chords, are most probably an oversight of the engraver of GE1.

category imprint: Differences between sources

issues: Errors in GE