This should be Eurocommerce Berlin according to the number it had, but unfortunately Berlin is grey and not bay, so it is a wild guess which horse this is, most probably also an Eurocommerce under Schroder.
The same horse as above, it had a bright red ribbon in its tail, probably for good luck.
This is Broere Phoenix, a dutch bred dressage horse under Kirsten Beckers. This horse did not contest at Chio, but most likely was there for experience and training.