Needing at least two wins in the last four games of the World Chess Championship, defending champion Viswanathan Anand lost 9th game against challenger Magnus Carlsen in Chennai on Thursday. A blunder in the 28th move by Viswanathan Anand gave the advantage to Magnus Carlsen, who won with black pieces again.Carlsen now leads Anand 6-3 and needs half-a-point from the next three games to clinch the title.