Issues : Omission of current key accidentals

b. 27

composition: Op. 28 No. 22, Prelude in G minor

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A (→FE,FCGE) has no  lowering a1 to a1, as in b. 19 (in the manuscripts the discussed bar is only marked as its repetition). The obvious inaccuracy was spotted only in EE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Omission of current key accidentals , Errors repeated in GE , Errors repeated in FE

b. 28

composition: Op. 26 No 2, Polonaise in E♭ minor

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A (→FEEE1) lacks  rising c1 to c1. The obvious Chopin's imprecision was corrected in GE and EE2, as well as in FES which displays  written in probably by Chopin himself.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , GE revisions , Omission of current key accidentals , Errors of A , Annotations in FES , Last key signature sign

b. 28

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

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In A there is no  raising d to d. The use of din the part of the R.H. proves Chopin's mistake, corrected already in GE1 (→FEEE, →GE2). 

category imprint: Interpretations within context; Differences between sources

issues: Omission of current key accidentals , Errors of A , Authentic corrections of GE

b. 28

composition: Op. 28 No. 21, Prelude in B♭ major

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In the sources there is no  lowering d1 to d1. Chopin's attention was caught by the beginning of the bar – he removed g1 from the 1st quaver; he also crossed out the second one and rewrote it next to it. 

category imprint: Interpretations within context; Editorial revisions

issues: Omission of current key accidentals , Inaccuracies in A , Errors repeated in GE , Errors repeated in FE , Errors repeated in EE

b. 29

composition: Op. 45, Prelude in C♯ minor

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FE1 is lacking naturals lowering f to f and d1 to d1. They were completed both in FE2 (two accidentals) and in EE (three). Also in GE the spaces between the notes clearly indicate that the accidentals were added only during proofing/revision. 

category imprint: Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in FE , GE revisions , Omission of current key accidentals , FE revisions