7601  

She told CLO: "Anything is possible if you try hard enough, like beating a GM." :)

As we confirm this as a record, here are some comparisons: GM Irina Krush defeated her first GM, Alexander Stripunsky at age 13. Judit Polgar, the highest rated female in chess history, defeated GM Lev Gutman at age 11. Polgar, 38, recently announced her retirement from competitive chess. Meanwhile Hou Yifan's rating soars, approaching 2700. 

Despite this loss, Ivanov went on to tie for first in the tournament with Abdi Farzad. Find the full tournament crosstable here. 

Carissa's rating is now 2131 and has till June 2015 to beat Annie Wang's recently set record for the youngest female USCF master. As Dylan McClain pointed out in the new York Times, Annie broke a record older than she was (previously held by GM Krush). 

Look for more Labor Day news in our upcoming round-up.