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b. 165-166

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

2 slurs to d2 in A, contextual interpretation

Slur to c2 in GE (→FE,EE,IE)

..

The top two-bar A slur reaches the 2nd crotchet in bar 166, which is almost certainly inaccurate – cf. the slurs between bars 169-170. The shorter GE slur (→FE,EE,IE) is an example of adjusting a mark to quaver beams.
The easiest explanation for the absence of the short c2-d2 slur in the editions would be an oversight, although the fact that all similar slurs were omitted in this fragment may point to a conscious strategy by the engraver of GE, which was supposed to make his work easier.

category imprint: Differences between sources

issues: Errors in GE , GE revisions

b. 165

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

..

In A there are no naturals to the 4th, 6th and 8th L.H. quavers – Be1A. The accidentals were added in GE (→FE,EE,IE).

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , GE revisions , Inaccuracies in A

b. 165

composition: Op. 12, Variations in B♭ major

..

In the main text we add a  raising c2 to c2, omitted in FE (→GE,EE).

category imprint: Interpretations within context

issues: Inaccuracies in FE , Errors repeated in GE , Errors repeated in EE

b. 166

composition: Op. 39, Scherzo in C♯ minor

 
 
..

At the end of the bar GC (→GE) has the fifth E flat-B flat. The consistent version of EE and FE, both having the octave E flat-e flat here, indicates the copyist's error. The fact that Gutmann's attention was distracted is confirmed by his two other obvious mistakes in bars 166-167: inaccurate slur and omission of the octave sign. 

category imprint: Differences between sources

issues: Errors of GC

b. 166-167

composition: Op. 39, Scherzo in C♯ minor

Slur in EE and FE

GC (→GE)

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In GC (→GE) the slur ends just above the last chord of bar 166, which definitely fails to match Chopin's intentions.

category imprint: Differences between sources

issues: Inaccuracies in GC