All just my personal opinion
Yulianna Avdeeva, Piano Recital, Kultur- & Kongresshaus Aarau, 2017-03-05 — Bach: Toccata in D major, BWV 912; Bach: Overture in the French Style, BWV 831; Chopin: Four Mazurkas, op.7; Chopin: Piano Sonata No.3 in B minor, op.58
(…) Yulianna at that time had just finished her concert diploma and had since become Prof. Scherbakov’s assistant (which presumably consists of filling in for him when he was away for concerts or for a recording session). This is now 3 years ago, and she has evolved as a pianist quite dramatically since then…