Derin had a good weekend at the CSI4* event in Poznan, Poland with all the horses in form.
Harry K opened with a fourth place in Friday's 1.55m Grand Prix qualifier counting for the Longines Ranking, and continued to impress on Sunday when ending 9th in the 1.60m Grand Prix to collect even more world ranking points.
Dadjak Ter Puttenen also jumped a super round in Thursday's 1.45m Longines Ranking class, with the fastest time of the competition but unfortunately a rail down prevented him from taking home the first place.
The 6-year-old Hunter also jumped clear in the first round of Thursday's youngster class.
The CSI4* event in Gross Viegeln, Germany, will be the next stop for Derin.