Skipper Gautam Gambhir struck his fourth half-century of the season as Kolkata Knight Riders defeated Chennai Super Kings by five wickets in the Indian Premier League game being held between the two sides. Chasing 140 for victory, the Knight Riders finished the task with two balls to spare, with Gambhir leading the way with a 52-ball 63 at the M A Chidambaram Stadium. The losing team coach Stephen Fleming believes that the team need to work on all areas if the defending champions want to get back to winning ways. (Content Owner: nnisipl5)