Total Points / Total SCs owned (neutrals and abandoned positions don't count) = Points per SC.
Multiple Points per SC by SCs a nation owns and that is how many they get.
So Russia wins with 18
France CDed with 3 left
Portugal is still neutral
Italy has 12
Everyone else is eliminated
Pot was 20 per nation (140 total pot)
18 (Russia) + 12 (Italy) = 30
140/30 = 4.66 PPSC
12*4.66 = 56
for Italy
In theory 18*4.66 = 84 for Russia but in reality, I believe Russia is capped at half the pot to prevent winners from waiting and trying to maximize their point gains (say, a 5 SC grab at the end for a solo was possibly, Russia might have held off to get an extra 3 SCs of points or 15 more points). We don't want to encourage unsportsman like conduct by rewarding it with extra points.