R Praggnanandhaa and Divya Deshmukh starred with crucial wins as India stunned a formidable China 4-2 in the ninth and final preliminary round to make the quarterfinals of the FIDE Online Chess Olympiad on Sunday.
The Indian team, which finished at the top of Top Division Pool 'A', will play the quarterfinals against a yet-to-be-decided opponent on August 28.
Four draws and two wins on Under-20 boards helped India pull off the victory against the Chinese.
The 15-year-old Praggnanandhaa appeared to be on the ropes, but managed to turn the tables on Liu Yan and finished with a perfect 6/6 score.
Divya Deshmukh, a former world under-10 and under-12 champion, put it across Jiner Zhu to underline her potential.
Vidit Gujrathi, the Indian captain, held world No.3 Ding Liren to a creditable draw on the top board while P Harikrishna also shared honours with Yangyi Yu.
Indian ace Koneru Humpy signed peace with the women's world No.1 Yifan Hou as did D Harika against the current world champion Wenjun Ju.
India claimed the top spot in Pool A with 17 points and 39.5 board points and became the first team to qualify for the quarter-finals.
India number 2 Harikrishna said he was delighted with the win over China and credited the youngsters -- Praggnanandhaa and Divya.
The pool winner advances directly to the quarter-finals while the second third-placed team from each of the four pools move to the preliminary phase of the knockout.
Earlier in the seventh round, India posted a 4-2 win over Georgia with former world champ Viswanathan Anand being held to a draw by Levan Pantsulaia.
In the eighth round, India registered a comfortable 4.5-1.5 win over Germany with captain Vidit Gujrathi leading the way by beating Rasmus Svane.
Results: Round 7: India beat Georgia 4-2 (Viswanathan Anand drew with Levan Pantsulaia; P Harikrishna beat Luka Paichadze; Konery Humpy drew with Meri Arabidze; D Harika lost to Nino Batsiashvili; R Praggnanandhaa beat Nikolozi Kacharava; Divya Deshmukh beat Diana Lomaia).
Round 8: India beat Germany 4.5-1.5 (Vidit Santosh Gujrathi beat Rasmus Svane; Harikrishna drew with Matthias Bluebaum; D Harika drew with Lara Schulze; Bhakti Kulkarni beat Filiz Osmanodja; Nihal Sarin drew with Roven Vogel; Vantika Agrwal beat Jana Schneider).
Round 9: India beat China 4-2 (Vidit Gujrathi drew with Ding Liren; Harikrishna drew with Yangyi Yu; Humpy drew with Hou Yifan; D Harika drew with Wenjun Ju; R Praggnanandhaa beat Yan Liu; Divya Deshmukh beat Jiner Zhu).
Final standings: Pool A: 1. India 17 points, 2. China 16, 3. Germany 11, 4. Iran 9, 5-6. Mongolia & Georgia 8, 7. Indonesia 8, 8. Uzbekistan 7, 9. Vietnam 6, 10. Zimbabwe 0.