Kolkata, April 11 (IANS) Royal Challengers Bangalore (RCB) skipper Virat Kohli won the toss and opted to field in their Indian Premier League (IPL) encounter against Kolkata Knight Riders (KKR) at the Eden Gardens here on Saturday. KKR made one change, bringing in spinner K.C. Cariappa in place of pacer Umesh Yadav. The teams: Kolkata Knight Riders: Gautam Gambhir (captain), Robin Uthappa, (wk)Piyush Chawla, Morne Morkel, Sunil Narine, Manish Pandey, Yusuf Pathan, Andre Russell, Shakib Al Hasan, Surya Yadav, KC Cariappa. Royal Challengers Bangalore: Virat Kohli (captain), Dinesh Karthik (wk), AB de Villiers, Chris Gayle, Darren Sammy, Sean Abbott, Varun Aaron, Abu Nechim, Harshal Patel, Yuzvendra Chahal, Mandeep Singh.