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b. 170

composition: Op. 50 No. 3, Mazurka in C♯ minor

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The last R.H. bottom voice crotchet in EE is a1, which is a mistake. It was most probably EE in which this patent Terzverschreibung was committed, since FE does not reveal traces of corrections in this place.

category imprint: Interpretations within context; Differences between sources

issues: Errors in EE , Terzverschreibung error

b. 170

composition: Op. 50 No. 3, Mazurka in C♯ minor

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The R.H. bottom voice crotchet on the 2nd beat of the bar is written in AI as f1. Chopin changed it to g1 while writing AF – one can see a crossed-out f1 next to the note.
In EE – just like in b. 164 – cautionary naturals were added before b and a.

category imprint: Differences between sources

issues: EE revisions , Enharmonic corrections

b. 171-172

composition: Op. 50 No. 3, Mazurka in C♯ minor

AI version

AF (→FE)

Same with  a2 in EE

..

Without access to [AG], it is impossible to determine whether and which version Chopin considered to be final. The general concordance between AI and GE suggests that this version was created first; however, even if it was the case, it does not mean that an alternative idea – the version of AF – was already the final word, since there are numerous examples, supported by sources, of returns to original versions, which was poignantly described by George Sand. Therefore, having a choice between two equal authentic versions, in the main text we give the text of GE, which is the principal source adopted for the entire op. 50.  

category imprint: Differences between sources; Corrections & alterations

issues: Chopin's hesitations , Accompaniment changes , Enharmonic corrections

b. 171

composition: Op. 50 No. 3, Mazurka in C♯ minor

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AI is lacking in the  lowering d1 to d1. We regard it as the composer's oversight – after two multiple progressions, in which the 1st note of the bar is a fourth higher than the preceding one, Chopin could have considered d1 to be obvious here.

category imprint: Interpretations within context; Differences between sources

issues: Omission of current key accidentals

b. 172

composition: Op. 50 No. 3, Mazurka in C♯ minor

Continuous slur in AI, GE & FE (→EE)

2 slurs in AF, literal reading

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In AF the slur breaks here; however, it is uncertain whether it was supposed to indicate a division of the slur – one can see it as an inaccurately written combination of the slurs, which is how it was interpreted in FE (→EE). In the main text we give the continuous slur of GE, which almost certainly corresponds to the notation of [AG]. See also the note in the next bar.

category imprint: Graphic ambiguousness; Differences between sources

issues: Inaccurate slurs in A