Jessica Diggins lost a lot but leads by a total of 55 seconds before the end of the weekend.
Up over the last crest, Natalia Neprjajeva had a gap and neither Andersson nor Katharina Hennig managed to get sucked in but had to make up for second place, which went to the German.
Andersson took home 15 bonus seconds through a jerk up to 6 km and then continued that jerk and grilled the others.
She had a small gap down towards the stadium but was caught by the others when they went out on the fourth and final lap.
Rosie Brennan had a nightmare stage and lost her second place.
She was 31st over two minutes after the lead.