[IMG]http://d.yimg.com/a/p/afp/20100428/capt.p***o_1272471750380-1-0.jpg?x=86&y=130&q=85&sig=NNQANlfph0bx0cw9JLlRmg--[/IMG]AFP - India's defending champion Viswanathan Anand took the lead Thursday after decisively winning the fourth game of his 12-game match for the world chess title against Bulgarian challenger Veselin Topalov.
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