From 2018, the handicap system will be adjusted so that handicap class 4 (EGA handicap 18.4 to 26.4) will be raised for handicap-effective competition results.
regles-de-golf Fédération Luxembourgeoise
Table on the handicap classes and buffer zones:
In Luxembourg there is a maximum increase of 2 (previously 3) for the Annual Handicap Review!