ВЫЗОВ The_ ЛИГА ЧЕМПИОНОВ, The_'s CHALLENGE CHAMPIONS LEAGUE

Referies, please explain how to make the choice of the templates.
We have 9 templates - by rules we need to delete 8 untill one stay.

My opponent told that we need to eleminate 6 templates and blue player will chose best of 3.

I know what wrote in rules, but please explain to foreign player this point.
Thank you in advance!