Skipper Dinesh Karthik (52) led from the front as Andre Russell (49 not out), Piyush Chawla (2/24) and Kuldeep Yadav (1/18) starred with bat and ball to help Kolkata Knight Riders (KKR) see off Rajasthan Royals (RR) by 25 runs and reach Qualifier 2 of the Indian Premier League (IPL) here on Wednesday.