A draw with Veselin Topalov leaves Anand still joint second and the Indian will have a tall task on hand to try and force matters with black pieces against Peter Svidler of Russia in the ninth and final round game.
Wesley So of United States continued to lead the tables by playing it out safe against compatriot Fabiano Caruana and took his tally to 5 points to remain a bit ahead of the field.
In the other two games of the ten-player round robin tournament, top seed Maxime Vachier-Lagrave drew with Ding Liren of China while Peter Svidler rose to form to beat Anish Giri of Holland.
With just one round to come now, Aronian, Topalov and Anand trail Wesley by a half point and it will be an interesting final round wherein Wesley has to meet Vachier-Lagrave who is tied fourth and in need of a victory to catch up.
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Anand tried hard but the victory eluded the Indian ace yet again. The enterprising battle arose from Berlin defense wherein Anand had his knight stranded in the corner for a long time but Topalov was saddled with a tripled pawn in the bargain.
Anand's attempt at creating more weaknesses did not work even though his position remained preferable. To Topalov's credit, accurate and active play held the balance for the Bulgarian. There were many interesting pitfalls for both players along the way to a well-fought draw.
This being the third leg, the final event of the year will be the London Classic in December.
Results round 8: V Anand (Ind, 4.5) drew with Veselin Topalov (Arm, 4); Anish Giri (Ned, 3) lost to Peter Svidler (Rus, 3); Wesley So (Usa, 5) drew with Fabiano Caruana (Usa, 4); Levon Aronian (Arm, 4.5) beat Hikaru Nakamura (Usa, 3.5); Ding Liren (Chn, 4) drew with Maxime Vachier-Lagrave (Fra, 4).