Issues : Last key signature sign

b. 436

composition: Op. 11, Concerto in E minor, Mvt I

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The traces of changes visible in FE prove that Chopin changed the enharmonic notation of the chord – c1 (with a cautionary ) replaced the original b​​​​​​​1. The change was most probably followed by subsequent ones – the cautionary naturals before the c1 semiquaver in bar 436 and c2 in bar 437 were removed. All those accidentals are actually superfluous after bars 434-435; however, they prove that the B major key, present from bar 324, triggered the composer to clearly mark the return to the E minor key, beginning in the discussed bars. 

category imprint: Corrections & alterations; Source & stylistic information

issues: Cautionary accidentals , Enharmonic corrections , Last key signature sign

b. 445

composition: Op. 39, Scherzo in C♯ minor

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In EE and GC (→GE) there is  before d2, which seems redundant. In FE the accidental was rather erroneously placed  before f2.

category imprint: Source & stylistic information

issues: Errors in FE , Cautionary accidentals , Last key signature sign

b. 447

composition: Op. 39, Scherzo in C♯ minor

Three-note chord in EE

Five-note chord in GC (→GE) & FE

Notation without cautionary 

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EE is most probably original. We cannot completely rule out chance omission of the chord elements written out on the bottom stave (a-h second is notated in the same way in the remaining sources).

In the main text we omit the redundant cautionary  before das it had no practical application.

category imprint: Differences between sources

issues: Cautionary accidentals , Last key signature sign

b. 453

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

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In the main text we omit the unnecessary in this context cautionary  before e1.

category imprint: Editorial revisions

issues: Cautionary accidentals , Last key signature sign

b. 455

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

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In A the only accidental before the 1st chord in the R.H. is the cautionary  before e2. From the musical point of view, the version with dwould be possible, yet a comparison with analogous bar 425 and a  of d3 added – probably by Chopin – already in GE1 (→FEEE, →GE2) prove Chopin's mistake. Chopin committed the same mistake in a similar context in bar 423.
In the main text we omit the unjustified  before e2.

category imprint: Interpretations within context; Differences between sources; Editorial revisions

issues: Cautionary accidentals , Omission of current key accidentals , Errors of A , Authentic corrections of GE , Last key signature sign