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b. 126

composition: Op. 12, Variations in B♭ major

Wedge in FE

No mark in GE & EE

..

The wedge over d4 ending the roulade in the preceding bar is placed in FE between the dashes marking the octave sign and the word loco at the end thereof. Consequently, it is poorly visible, which probably resulted in it having been omitted in the remaining editions.

category imprint: Differences between sources

issues: Errors in FE , Errors in EE

b. 127

composition: Op. 29, Impromptu in A♭ major

..

In A the fermata overlaps the slur, which probably contributed to the error of the engraver of GE who interpreted it as a staccato dot. We double the fermata in the L.H. analogously to FE and EE.

category imprint: Differences between sources; Editorial revisions

b. 127-128

composition: Op. 24 No. 4, Mazurka in B♭ minor

A probable reading of A (→GE)

A possible reading of  A

FE (→EE1EE2)

..

A (→GE) has triads as the 2nd and the 3rd crotchets of those bars, although in the first triad in bar 127 the note c1 is practically invisible in the manuscript. When proofing FE, Chopin removed the middle notes of the triads leaving only the sixths. That corrected version was repeated in EE1 (→EE2). EE3 returned to the version of GE1 with the full triads (the omitted note b flat on the 2nd beat of bar 128 must be a mistake).

category imprint: Graphic ambiguousness; Differences between sources; Corrections & alterations

issues: EE revisions , Authentic corrections of FE , Uncertain notes on ledger lines

b. 127

composition: Op. 24 No. 4, Mazurka in B♭ minor

..

The indication written in A as ritenuto was shortened to riten. in GE (→FEEE). In EE, the abbreviation was placed between the staves. 

category imprint: Differences between sources

issues: EE revisions , GE revisions

b. 127

composition: Op. 24 No. 4, Mazurka in B♭ minor

A probable long accent in A

A possible short accent in A (→GEFEEE)

..

The accent type that Chopin used in this bar is not obvious. There are more arguments, both graphic and musical, for the long accent option.  GE (→FEEE)  all have short accents.

category imprint: Differences between sources

issues: Long accents