Viswanathan Anand defended skilfully as he split the point with Hungarian GM Peter Leko to remain in the lead after the sixth round of the World Chess championship here.The draw, however, allowed Israeli Grandmaster Boris Gelfand to catch up with Anand at the top after beating Russian Grandmaster Alexander Morozevich.Anand and Gelfand have four points from six games and have a slender half-point lead over their nearest rivals.
