[1] He, Zahar Efimenko and Andrei Volokitin tied for first place in the Under 14 section of the World Youth Chess Championships in 1999; Timofeev finished second on tiebreak.

Timofeev tied for first with Evgeniy Najer, Kaido Külaots, Zoltan Gyimesi, Sergey Grigoriants and Oleg Korneev at the Cappelle-la-Grande Open of 2004, finishing third on tiebreak.

[3] In 2005 he won the Russian Junior Championship[4] and tied for 2nd-5th with Kamil Mitoń, Zhang Pengxiang and Lázaro Bruzón at the Samba Cup in Skanderborg, Denmark.

[9] Thanks to the latter victory, Timofeev qualified for the Superfinal of the Russian Chess Championship, held in October 2008, where he scored 6/11, finishing seventh out of twelve participants.

[10] In 2009 Timofeev participated in the Elite group of the 44th Capablanca Memorial, a category 17 double round-robin tournament, where he scored 4 points out of 10.