FIDE introduced a rating system for rated chess games played in FIDE Online Arena (FOA) playing zone.
The rating system calculates ratings depending on the time control of a rated game. Therefore, a full member may acquire three different ratings for rapid, blitz and bullet activity, hence the abbreviations RBB ratings and RBB regulations.
Those ratings do not influence over the board game activity and subsequent ratings which are included in monthly FIDE Rating Lists (FRL) for rapid and blitz over the board games.
More information is coming soon.