London: Defending champion Viswanathan Anand suffered yet another defeat in the London Chess Classic as the Indian Grandmaster went down to Russian Grandmaster Alexander Grischuk in the sixth round that concluded at the Olympia Conference Centre, here on Thursday.

With this win Grischuk joined Anish Giri of Hland, Hikaru Nakamura of United States and Maxime Vachier-Lagrave of France in the lead on four points, while Anand dropped back to ninth place.

After drawing the first three rounds, this was Anand's third decisive result in a row and second where the Indian ace lost the game.

Levon Aronian of Armenia, World champion Magnus Carlsen of Norway, Michael Adams of England and Fabiano Caruana of United States share the fifth spot jointly on 3.5 points each.

With 2.5 points in his kitty, Anand is ahead of Bulgarian Veselin Topalov by a full point but is now in a desperate situation in the $300000 prize money tournament.