Norwegian prodigy Magnus Carlsen was crowned the new world chess champion on Friday after he drew a tense 10th game against holder Viswanathan Anand to take an unassailable lead in the 12-round duel. The 22-year-old Carlsen, the current world number one, won three games and drew seven to achieve the victory mark of 6.5 points in a one-sided contest in the Indian's home city of Chennai.