The victory with white pieces helped Grover to jump to joint second spot on five points out of a possible six. Yu Yangyi of China regained sole lead on 5.5 points defeating S P Sethuraman in a keenly contested game.
Grover was in his elements in a Nimzo Indian defense game against Gujrathi. It was a complex middle game wherein Gujrathi was the first to err and Grover won a pawn to reach a better endgame.
Sethuraman played the Najdorf Sicilian and showed excellent preparation in the early part of the game. However, Yangyi got the balance in his favour with an over-the-board improvement and Sethuraman's king came under fire.
The Indian sacrificed a piece but could only reach a slightly worse endgame where Yangyi's technique was too good.
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Yangyi is now followed by Grover, defending champion Alexander Ipatov of Turkey, Urii Eliseev of Russia and Debashish Das who all have five points apiece.
Aulia Warda Melina of Indonesia seized the lead in the girls' championship being played simultaneously defeating top seed Alina Kashlinskaya of Russia. The Indonesian girl took her tally to 5.5 points in all.
The all-Indian duel between Rucha Pujari and Padmini Rout ended in a draw and both inched to four points out of their six games.