Kuranyi scored his 15th goal of the season, and 10th with his head, in front of 50,000 fans at the Veltins Arena.
Schalke coach Mirko Slomka said the championship would go down to the wire.
"We had to show patience today [Saturday]," he said. "But we never faltered and deserved our victory. I think the title will be decided on the 34th and final day."
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