Following the four National Trials the International Trial will be held, usually in early/mid September. The International trial rotates around the four nations year on year.
The ultimate test is the Supreme Championship Course in which the dog has to go and fetch ten sheep, bring them to the middle of the field, and then turn to fetch another ten sheep.
For this reason it is called a 'double fetch'.
This is used at the International Trials to find the best from the final fifteen dogs.