Vidit Gujrathi crashed through the defences of Hans Moke Niemann of the United States to join the leaders' pack on 4.5 points.
The India 'A' and 'B' teams registered comprehensive seventh round victories
Arjun Erigaisi is in joint lead with 4.5 points from five rounds along with World No. 1 Magnus Carlsen and Vladimir Fedoseev after holding the Norwegian superstar in round five.
Teenaged Grandmaster D Gukesh shocked world number 5 Fabiano Caruana as India 'B' pulled off a superb 3-1 win over number 2 seeds USA in the eighth round of the Open section of the 44th Chess Olympiad in Mamallapuram, Chennai on Saturday.
India was held to a 3-3 draw by lower-ranked Mongolia in the sixth round as favourites China grabbed the top spot in Pool A in the FIDE Online Chess Olympiad on Saturday.
In the women's event, Padmini Rout, R Vaishali and Bhakti Kulkarni posted wins in the first round. D Harika will be joining them in the second round, courtesy a bye in the first round.
With the top spot assured in the pool with a round to go, India was held to a 3-3 draw by a fighting Slovenia.
India will be fielding three teams each in the Open and women's sections respectively.
China would have been among the top medal contenders in the Olympiad and their absence would brighten India's chances.
India's top player and Asian Games gold medallist Koneru Humpy, who had come back into medal contention after a modest performance on day two, had to settle for the sixth place though she logged eight points.
After the first game against the same opponent ended in a draw, Harika was with black pieces in the second and she employed a French defence and Kosteniuk did not have many answers.
The Indian team includes country's number two Vidit Gujrathi, P Harikrishna and Koneru Humpy. B Adhiban and D Harika are the the reserves members. The field for the event includes six former world champions, plus 12 others who have been Candidates to the throne at some point.
Harika had carried the Indian hopes nicely till the tie-breaker of the third round. However, she got a jolt in the first game of the rapid tie-break where both players had 25 minutes on their clock.
Five-time World champion Viswanathan Anand will lead India's charge at the online Nations Cup beginning on Tuesday, where some of the world's best players will face off amid the coronavirus pandemic which has thrown the sporting calendars out of gear. The six-team event, touted to the richest online team tournament, features all the big names in the game with World champion Magnus Carlsen being the only big gun missing from the line-up.
In the women's event, India's D Harika drew with Nino Bastiashvili (Georgia) to move up to four points. She is in joint third place with six others.
In the women's section being held simultaneously, the Indians came back strongly to beat Poland 3-1 aided by victories from D Harika and Tania Sachdev on board two and three. Its surprising that Tania Sachdev was rested in the previous round when the Indian team drew with Serbia, losing on last two boards.
India 'B' played out a 2-2 draw against Azerbaijan in the 9th round of the open section, while India 'A' and 'C' teams registered identical 3-1 wins in the 44th Chess Olympiad in Mamallapuram, Chennai, on Sunday.
Grandmaster D Harika missed out on some chances to settle for a draw with Georgia's Sopiko Guramishvili, while Padmini Rout survived a scare before enforcing a draw with China's Tan Zhongyi in the first game of the third round of World Women's Chess Championship in Tehran.
The seasoned Anand beat Russian GM Ian Nepomniachtchi in just 17 moves in a fifth round match. But India were held to a 2-2 draw by Russia in the ongoing Online Nations Cup.
In the women section being held alongside, Indian women played out a hard-fought draw against experienced Georgia 1 team. All the games were drawn.
Meanwhile in the women's event, Padmini Rout and R Vaishali joined compatriot Bhakti Kulkarni in the second round.
Indian players experienced mixed fortunes in the second round of the FIDE Grand Swiss chess tournament here with two each in the men's and women's sections registering victories.
Krishnan Sasikiran guided Indian men to a 2.5-1.5 win over Czech Republic but the women's team suffered a shocking 1-3 defeat against Hungary in the eighth round of the 43rd chess Olympiad, in Batumi, on Tuesday.
Adhiban will face the winner of the match between Vidit Santosh Gujrathi and Alexander Fier, who play the tiebreak on Saturday.
With the Indian teams doing well so far, they can run into one another in the competition.
The Grand Prix consists of four legs, with a total of 21 participants. Each of the 21 players participates in three out of four Grand Prix legs. Each GP is a 16-player knockout event.
Humpy was no match for Alexandra Kosteniuk of Russia, going down 2-9 while Harika was ousted by world No.1 Hou Yifan of China
The game incidentally was an old Sicilian where Shirov tried an unconventional ninth move.
Vaishali fell behind early and could not catch up against Gunina, who had finished runner-up in the first leg.
China won the top prize on the basis of having won the round-robin stage.
Vaishali came back from 2-4 down to oust the experienced Ukrainian by winning the last two bullet games.
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.
Indian men's chess team, led by five-time world champion Vishwanathan Anand, played a 2-2 draw against the Russian squad in the sixth round of the ongoing 43rd Chess Olympiad, in Batumi, on Sunday.
Former world champion Viswanathan Anand came into his own with a much-needed win over Jan-Krzystof Duda in 78 moves in the second round after losing to his opponent in the first round.
India played out a 2-2 draw against Europe in Online Nations Cup chess tournament in the eighth round, a setback after their first win in the event notched up against the Rest of the World. Vidith Gujrathi ended his barren spell with a win over Levon Aronian of Europe with white pieces while Jan-Krystozf Duda beat P Harikrishna to level the scores in the match on Friday.
Former World champion Viswanathan Anand and India cricketer Yuzvendra Chahal among others took part in an online chess charity event, raising Rs 8.8 lakh for the waste pickers' community fighting the coronavirus pandemic. "Chess For Charity", held on Saturday on chess.com, saw India No.1 Anand, No. 2 Vidit Gujrathi, Grandmaster Nihal Sarin, Woman Grandmaster Tania Sachdev and Croatia's Antonio Radic take on a team of comedians comprising Biswa Kalyan Rath, Samay Raina, Abhishek Upamanyu and Aakash Mehta.
The announcement was made by Tamil Nadu chief minister M K Stalin on his Twitter page
India men's team's medal chances took a hit as Grandmaster Krishnan Sasikiran lost a crucial match which resulted in Indian men's team shock defeat at the hands of eighth seeded Armenia in the ninth round of the 43rd Chess Olympiad in Batumi.
Grandmaster D Harika bowed out of the world championship after playing a draw in must-win second game with former Bulgarian world champion Antoaneta Stefanova in the semifinals, which she lost 0.5-1.5 in Khanty Mansiysk, Russia.
Grandmaster D Harika will lock horns with Zhao Xue of China in the quarter-finals of the World Women's Chess Championship in Khanty Mansiysk, Russia. Having reached the last eight stage, Harika meets the biggest challenge in the championship and if she wins this match she can prove to be a very tough competitor for the other opponents.