GM Al Rakib Abdulla of Bangladesh adopted Nimzo Indian defence against GM Vidit and the game went on expected lines until move 19.
When Vidit doubled his rooks on the open b-file, Abdulla exchanged one of the rooks to minimise Vidit's attack.
But, Vidit made a stunning rook sacrifice on the 23rd move, leading to a knight fork of Abdulla's king and queen as the Bangladeshi GM resigned immediately.
The second board game between Pantsulaia Levan of Georgia and Ziaur Rahman of Bangladesh also ended with a similar result, but it lasted 44 moves.
In a same colour bishop ending, Orissa's only GM Debashis Das had to give up his bishop to prevent Russia's Konstantin Landa's pawn on b- file from queening. Debashis resigned on the 41st move.
Top seeded Nigel Short of England could not wriggle out of his poor form, as Orissa's international master Swayams Mishra forced him to concede his third draw in six games to less stronger opponents.
Kolkata's hopes GM Deep Sengupta and IM Diptayan Ghosh came back into reckoning by defeating Abhishk Kelkar of Maharashtra and CRG Krishna of AP respectively.
However, GM Neelotpal Das of Kolkata, representing PSPB went down to M. Shaym Sundar, another grandmaster from PSPB.
National woman champion Mary Ann Gomes was held to a draw by lower rated Harsha Bharathkoti of AP.
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