Hannover and Stuttgart both had a man sent off as their clash finished in a 1-1 draw on Saturday.
Borussia Dortmund beat VfB Stuttgart to climb up to 10th in the Bundesliga with a third straight win.
Former Stuttgart defender Sebastian Rudy left his old club rooted to the bottom as his late goal earned Hoffenheim a 2-1 win.
Bayern Munich maintained an eight-point advantage at the top while sending Stuttgart to the bottom after a 2-0 win.
Cologne and Stuttgart drew a blank in their Bundesliga contest on Wednesday.
Borussia Dortmund slipped back to the bottom of the Bundesliga despite picking up a point in their goalless draw at Bayer Leverkusen.
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