It was hard work for Sethuraman out of a Sicilian defense game where the Chinese played black. The Rauzer variation by Sethuraman lived up to its reputation, resulting in wild complexities.
Sethuraman calculated and judged well when he parted two rooks for the black queen and the resulting endgame was played well by the Indian. The game lasted 55 moves.
Overnight joint leader, B Adhiban played out a draw with in-form Ehsan Ghaem Maghami of Iran in another battle that lasted long. Maghami got a good opening as black in the Ruy Lopez but allowed some counter play to let Adhiban take the initiative. Then Adhiban treaded on thin ice before securing the draw after 71 moves.
With four rounds still remaining, six more are in pursuit of the leaders with 3.5 points, while fifteen others including Indian Grandmasters Krishnan Sasikiran, Parimarjan Negi, Surya Shekhar Ganguly, Vidit Gujarathi G N Gopal, V Vishnu Prasanna, Debashish Das and Abhijeet Kunte are also in contention with three points apiece.
The two Indian stars -- Krishnan Sasikiran and Parimarjan Negi -- were held to draws by compatriots Gujarathi and Das, respectively.
The middle game arising out of Ruy Lopez forced Zhansaya to think for long and she fell under time pressure, which proved decisive in the end.
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