Efroimski at the Israeli Championship Finals, December 2008
|Born||February 13, 1995|
|Title||Woman FIDE Master|
|FIDE rating||2246 (November 2014)|
|Peak rating||2331 (September 2014)|
Efroimski won the World Youth Chess Championship twice, Girls Under-12 at Kemer in 2007, and Girls Under-14 at Antalya in 2009, as well as the Under-14 girls European Youth Chess Championship at Fermo in 2009.
She represented Israel in the Women's Chess Olympiad at Dresden 2008, at Khanty-Mansiysk 2010, and at Istambul 2012 She was awarded the Woman FIDE Master title in 2008, and the Woman International Master title in 2011.
- Dreams Into Lightning - Morning Report: November 30, 2007
- Haaretz.com - Chess for every child
- Chess-Results.com - European Youth Chess Championship 2009 Girls - 14
- ChessBase.com - Gil and Marsel – Schoolmates and Champions
- Olimpbase.org - 38th Chess Olympiad (women): Dresden 2008
- Efroimski at the 2010 chess olympiad Archived 2016-09-02 at the Wayback Machine.
- Efroimski at the 2012 chess olympiad Archived 2012-08-30 at the Wayback Machine.
- FIDE Chess Profile - Efroimski, Marsel
- Results Archived 2012-10-21 at the Wayback Machine. of the Girls U-16 European Chess Championship 2001