[3] In 2010, in the 6th World School Chess Championships in Kayseri, Turkey, Obolentseva came in second place on tie-break in the girls U9 section, losing out to Khanim Balajayeva from Azerbaijan.

[8] At the World Youth Championships 2010 in Halkidiki, Greece, under the guidance of her new coach, Vladimir Vulfson, she finished third in the girls U10 division.

[15] In February 2016, she shared first place with Anastasia Bodnaruk and Soumya Swaminathan in the women's event of the Moscow Open, finishing third on tiebreak.

[19][20] The following month, she played for the silver medal-winning Russian team in the World Youth U16 Chess Olympiad in Poprad, Slovakia.

[26] In October 2019, she won bronze medal in World Youth Chess Championship in girl's U18 age group.