It has bolstered the home team's medal chances at the 14-day event, which is expected to see massive participation from more than 150 countries.
It took Gujrathi 40 moves to outwit Benjamin and now he shares the lead with six others. The fourth Indian to cross the 2700 ELO rating barrier, Gujrathi will face American Grandmaster Aleksandr Lenderman in the fifth round.
Both Anand and Sethuraman inched themselves up to five points out of a possible seven and shared the joint eighth spot after a rather dull day that witnessed several draws on the top tables.
Viswanathan Anand was held to a draw by Vladislav Artemiev of Russia in the eighth and penultimate round, ending the Indian challenge in the Isle of Man International Chess tournament on Sunday.
High-flying with his superman-cap, overnight joint leader Grandmaster Gupta ran out of steam and surrendered to Nakamura on a day when B Adhiban also did well to hold Levon Aronian of Armenia to a creditable draw.
A summary of sports events and sports persons, who made news on Friday
Grandmaster B Adhiban finished tied third at the Chess.com Isle of Man International tournament after beating the highly-regarded Michael Adams of England in the ninth and final round, in Isle of Man (UK) on Monday.
A summary of sports events and sports persons, who made news on Saturday.
A summary of sports events and persons who made news on Thursday
Summary of sports events and persons who made news on Saturday
A summary of sports events and sports persons, who made news on Thursday
A summary of sports events and persons who made news on Thursday