Piano Forum

It's just a matter of interpretation, practice and nuances. He thinks you make the inner voices just as important as the top voice, so he inserts all sorts of nuances in order to make it so. In this case, he just devides the two notes and puts more emphasis on the bottom one (because if you want the bottom note to stick out you need to play it "harder", because the ear always tends to hear the higher note more clearly). But he adds these nuances in different parts of the piece too.
Sofronitsky believes that mazurkas should be played with quite a bit of liberty (I.E - the player can change the piece a bit to match his own understanding of its "essence"). Some players do it with the mazurkas (including myself), but some think you should stay more faithful to the original score, so they play it more or less as written (which is why most pianists play it without strong nuances).