Damallsvenskan has developed into a duel between Häcken and Hammarby.
Then came a costly loss of points for Hammarby in Norrbotten.
Despite Hammarby controlling large parts of the match, Piteå took the lead after half an hour through Julia Olsson.
Hammarby were saved from defeat when Andrea Simonovic accidentally put the ball into her own net after a pass from Madison Pogarch with ten minutes remaining. The Stockholmers continued to press but had to settle for a draw.
The two lost points mean that Häcken now leads alone after eleven rounds played, two points ahead of Hammarby.
