There are 9 couples. They are scored on their leaderboard position and public vote, then added together.
Top of leaderboard position scores a maximum of 9 so Tasha amd JB both have 9.
The maximum number of marks from both components would be 18 this week.
If Tasha or JB comes last in the public vote, then they score 1. So their total is 10.
If someone like Jamie, because of all the ties has 5 points for being bottom of leaderboard, but is the 3rd most popular in public vote then he scores 7 for that and his total will be 12. In fact, if both JB and Tasha are least popular tonight, then he will beat both of them!