Uzbek Grandmaster Marat Dzhumaev defeated second-seeded Anton Korobov of Ukraine in the fourth round to remain sole leader in the fifth Rose Valley Kolkata Open Grandmasters’ chess tournament at the Gorky Sadan here on Thursday.

The 17th-seeded Uzbek, who was never considered a title prospect, was down by a pawn and bishop in the middle game but recovered remarkably to stun Korobov. IM Vidit Santosh Gujrathi and GM Mikhailo Oleksienko of Ukraine were joint second with 3.5 points each. Top-seeded GM Radoslaw Wojtaszek was once again held by an Indian GM, M.R. Venkatesh this time.

Important results ( fourth round):

Marat Dzhumaev (Uzb, 4) bt Anton Korobov (Ukr, 2.5); Radoslaw Wojtaszek (Pol, 3) drew with M.R. Venkatesh (3); Arun Prasad (3) drew with Abhijeet Gupta (3); Suri Vaibhav (3) drew with S.S. Ganguly (3).

Mikhailo Oleksienko (Ukr, 3.5) bt Deepan Chakkravarthy (2.5); K. Rathnakaran (3) drew with Mark Paragua (Phi, 2.5); Srinath Narayanan (2.5) lost to V.S. Gujrathi (3.5); S.P. Sethuraman (3) drew with Debasish Das (3); Ni Hua (Chn, 3) bt Shardul Gagare (Ina, 2.5); Viorel Iordachescu (Mda, 3) bt R.R. Laxman (2).

More In: SPORT | Today's Paper