The X-factor around mystery spinner Varun Chakaravarthy's bowling influenced his selection for India's last Champions Trophy group game against New Zealand, skipper Rohit Sharma said here on Sunday after the move proved to be a masterstroke. Chakaravarthy justified his selection in the XI with excellent figures of 5/42 in 10 overs, as India registered a convincing 44-run victory to top Group A on way to the semifinals alongside the Kiwis in second place. "He has got something different about him, so wanted to try and see what he had to offer. We got to think a little about what to do for the next game, it's a good headache. If he gets it right, it's very difficult to read him," Rohit said of Chakaravarthy at the presentation ceremony. India will play Australia in the first semifinal here on Tuesday with New Zealand taking on South Africa the following day in Lahore. "It will be a good game, Australia has a rich history of playing well in ICC tournaments, but is is about us and what