Tigran Petrosian during his match against Darmen Sadvakasov on Friday. A Telegraph picture

Calcutta: Three Grandmasters — Sergei Tiviakov, Tigran Petrosian and Darmen Sadvakasov share the lead with five points each after round VI of the Calcutta Open chess at Gorky Sadan on Friday.

With no clear leader in sight, the meet is still wide open.

On the top board, overnight leaders Petrosian and Sadvakasov preferred to slug it out in a sharp Sicilian Dragon. Sadvakasov obtained a passed e-pawn, but his weakness on the kingside allowed Petrosian to force a draw.

Top seed Tiviakov made short work of Sriram Jha in a Ruy Lopez opening. The Dutch won two minor pieces for a rook in the 27th move. His two strong bishops coupled with Jha’s weakened kingside forced the latter’s resignation.

Diwakar Prasad Singh once again produced a dazzling game, this time against GM Mekheil Kekelidze of Georgia.

Kekelidze was stunned by Diwakar’s pawn sacrificeon the 25th move in a Queen’s Indian defence. By move 33, Diwakar was already better, though the game lasted 50 moves.

TOP BOARD RESULTS

Tigran Petrosian (5) drew Darmen Sadvakasov (5); Sergei Tiviakov (5) bt Sriram Jha (4); Levan Pantsulaia (4) drew Alon Greenfeld (4.5); Somak Palit (3.5) lost to Dimitri Komarov (4.5); D.P. Singh (4.5) bt Mekhiel Kekelidze (3.5); Tejas Bakre(4) drew Abdulla Al Rakib (4); Enamul Hossain (3.5) lost to G.N. Gopal (4.5); S Kidambi (4.5) bt S.P. Sethuraman (3.5); Safin Shukrat (4.5) bt Vidit Gujarathi (3.5); Surya Sekhar Ganguly (4) bt S Arun Prasad (3); Arghadip Das (3.5) drew with Abhijit Kunte(3.5); K. Ratnakaran (3) lost to Saidali Iuldachev (4); Saptarshi Roy Chowdhury (3.5) drew Alexander Fominyh (3.5); B.T. Muralikrishnan (3) lost to Deepan Chakravarthy (4); M.R. Venkatesh (3.5) drew P.D.S. Girinath (3.5); Dibyendu Barua (3.5) drew Shankar Roy (3.5).