CHENNAI, India — World champion Viswanathan Anand struggled once again with his white pieces and suffered a painful defeat against challenger Magnus Carlsen of Norway in the sixth game of the World Chess Championship. As things stand at the halfway stage of this 12-game World Championship match, Carlsen leads 4-2. So far, the energy of Carlsen has proved far more effective than Anand's experience. Now it is for the Indian to stop the challenger from gaining another 2.5 points off the next six games. Carlsen only needs to stay undefeated in five more encounters to take the title away. Late into the fifth hour of play, the champion looked upset. — Agencies
