Robert Lewandowski's added-time goal earned Bayern Munich a 1-1 draw at Hertha Berlin on Saturday.
Hoffenheim stumbled to a 2-1 defeat at Wolfsburg on Sunday as all six clubs chasing Bayern lost over the weekend.
Bundesliga leaders Bayern Munich saw their winning run come to an end as Schalke battled to a 1-1 draw at the Allianz Arena.
Everton have signed Germany U20 forward Anton Donkor on loan from Wolfsburg until the end of the season.
Hoffenheim suffered their first Bundesliga defeat of the season as they went down 2-1 at RB Leipzig.
Red Bull Leipzig moved back to within two points of Bundesliga leaders Bayern Munich with a comfortable 3-0 win over Eintracht Frankfurt.