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b. 1-2

composition: Op. 28 No. 18, Prelude in F minor

..

In A in both bars Chopin wrote and then crossed out the flats (cautionary?) before the 1st d quaver.

category imprint: Corrections & alterations; Source & stylistic information

issues: Cautionary accidentals , Deletions in A , Last key signature sign

b. 3

composition: Op. 28 No. 18, Prelude in F minor

..

We add cautionary flats before the penultimate semiquaver d1(2). The accidental in the R.H. part was already added in EE, however, in EE1 it is a mistaken , corrected into  only in EE2.

A flat is also visible there (in the R.H.) in FC. It is a later annotation, absent from GE.

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

issues: EE revisions , Errors in EE

b. 4

composition: Op. 28 No. 18, Prelude in F minor

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A (→FE) has a cautionary  before the 7th L.H. semiquaver, a1. The accidental was omitted in FC (→GE1), however, EE and GE2 have flats there in both the L.H. and R.H. parts. We also include these signs in the main text.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , GE revisions , Cautionary accidentals , Errors of FC

b. 5-7

composition: Op. 28 No. 18, Prelude in F minor

..

In A one can see that in b. 5 Chopin initially wanted to lead the L.H. semiquaver sequence to the middle of the bar. He also introduced a similar change into b. 7, in which he started writing L.H. semiquavers from the beginning of the bar.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A

b. 5

composition: Op. 28 No. 18, Prelude in F minor

..

We add cautionary flats before b(1) at the beginning of the bar.

category imprint: Editorial revisions