London:Chelsea's celebrations for an English premiership title were put on hold after Arsenal beat Tottenham Hotspur 1-0 in a robust north London derby to keep alive their own slender hopes of retaining their Premier League title. Chelsea, who have 85 points to Arsenal's 74, will clinch their first title since 1955 with a win at Bolton Wanderers on Saturday no matter what Arsenal do in their last four matches. On Wednesday Chelsea will also start as clear favourites in a Champions League semi-final first leg against a Liverpool side they beat in the League Cup final in February. Meanwhile, Chelsea signed a five-year sponsorship deal with South Korean electronics firm Samsung. No financial details of the Chelsea deal were available. Media reports put its worth at 50 million pounds.