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Nihal Sarin and S L Narayanan won a game each between them in the Blitz tournament.
The Indian GM scored the famous win in round eight of Tata Steel Chess India blitz event.
Keralites Nihal Sarin and S L Narayanan finished on four and three points respectively.
Fellow Malayali GM, Nihal Sarin, also remained unbeaten on day one.
World No. 1 Magnus Carlsen is the star attraction of the event.
The prize money for the Indian leg of the tour will be $500,000.
The Kerala-based Grandmaster remained unbeaten in the nine-round tournament.
Gujrathi won the match with black pieces as he exploited a tactical oversight from his famous opponent.
The lawsuit, filed at a US District Court in Missouri, also lists Carlsen's online chess platform Play Magnus, Chess.com executive Danny Rensch and American Grandmaster Hikaru Nakamura as defendants.
Carlsen, 31, withdrew from the Sinquefield Cup in St Louis, Missouri, earlier this month after losing to the 19-year-old, who lags him by almost 200 Elo points.
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