While Gujrathi outclassed Jurab Javakhadze of Georgia, Sethuraman got the better of Vahe Baghdasaryan of Armenia in their fourth round encounters.
On what turned out to be a good day for the Indian boys, Gujrathi made most of the opportunities in a complex game against Javakhadze from the black side of an irregular opening.
Getting his knight posted in the center of the board, Gujrathi exerted pressure and the Georgian did not have a chance.
The other Indian Grandmaster in the fray, Sahaj Grover also scored a fluent victory over Benjamin Arvola of Norway.
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Playing the white side of a Nimzo Indian defense, Grover made early inroads in black's position with some finely crafted manouvres in the middle game.
Arvola could not resist for long as the pressure mounted on the queen side resulting in a loss of piece for the Norwegian. The game lasted just 25 moves and Grover took his tally to three points out of a possible four.
With Yangyi in front, as many as eight players are in close pursuit half a point behind including Gujrathi and Sethuraman.
Grover and Debashish Das are both on three points after the latter was held to a draw by Muhammad Luthfi Ali of Indonesia.