After anchoring India to a six-wicket victory against Pakistan in the World Twenty20 here, Man of the Match Virat Kohli said a score on the board helped him to calculate better and that was the reason for his success in run-chases."I think a score on the board always helps me calculate better," he said after his 33-ball 55-run knock that fashioned India's win at the Eden Gardens.Kohli noted it was a challenging wicket. "You need new challenges every innings that you play."Kohli said he was disappointed after getting out in the 20s in India's previous encounter against New Zealand."I knew if I had scored 40-45 we could have won. That really hurt because we do not bat like that at home," he said, adding, "Today it was all about keeping calm and luckily I got a great partnership with Yuvraj."