Codeforces

There are 4 divisions (Div 1--Div 4), and the lower bound for Div 1--Div 3 is 1900/2100, 1600, 1300.

The 1900 bound (candidate master) for Div 1 applies to regular rounds where there are separate Div 1 and Div 2 contests, while the 2100 bound (master) applies to Div 2 only rounds.