Kosintseva won the gold medal in the Girls Under 10 category of the 1996 European Youth Chess Championships, held at Rimavska Sobota.

[4] She won the European Individual Women's Chess Championship in 2007 with a tournament performance rating (TPR) of 2774.

[6] In 2010 Kosintseva won the FIDE Women's Grand Prix event in Nalchik with a performance rating of 2735.

[9] In April 2014, she won the bronze medal at the Women's World Blitz Chess Championship in Khanty-Mansiysk.

[10][11] In July of the same year, she took the silver medal in the European Individual Women's Championship in Plovdiv, Bulgaria scoring 8½/11 points.