Kolkata Knight Riders defeated Chennai Super Kings by 10 runs via Duckworth-Lewis method in a rain-marred Indian Premier League match here today. Chasing 115 for victory, KKR were 61 for two after 10 overs when heavy rains stopped play. Brief Scores: Chennai Super Kings: 114 for four in 20 overs. (S Badrinath 54, Albie Morkel 30 not out; I Abdulla 1/15). Kolkata Knight Riders: 61 for two in 10 overs (Jacques Kallis 21 not out, Manoj Tiwary 15 not out).