Welcome to Planet Kubb. You (or your team) are only allowed to throw 6 during your turn. But, it you have 9 to throw at then that means you have field kubbs in play. The idea is when throwing the field kubbs back to the opponents side of the pitch that you should try to get the kubbs in a tight grouping so that you can hit more than 1 down with a single throw. So, it is possible (and very necessary for winning in a lot of games) to be able to knock down 9 kubbs in 1 turn.