After playing it safe in normal time control, Harika dominated the proceedings in the rapid games and should have won in the first set itself as she misplayed a winning position in the second rapid game.
However, the Andhra girl did not lose heart and came back even stronger in the 10-minute game to ensure a smooth sailing into the quarterfinals for the third time in a row.
The other Indian in the fray, Padmini Rout turned out to be luckless in the tie-breaker against Tan Zhongyi of China and squandered away a full point lead before bowing out of the competition.
Top seed Ju Wenjun of China and third seed Alexandra Kosteniuk of Russia also made it to the quarterfinals, holding their nerves together against Olga Girya of Russia and Pia Cramling of Sweden respectively.
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The quarterfinals will see Harika clash with Nana Dzagnidze of Georgia and the Indian will start as a slight favourite on rating and her superior form she has displayed thus far especially in the faster version.
Harika survived some anxious moments in the rapid tie-breaker before steering herself to safety in a complex rook and pawns endgame.
The first game under 10-minute time control was a game of fluctuating fortunes but Harika kept herself in contention and made the most of her chances. Needing a win in the return game, Guramishvili did not find the required resources.
Results Round 3: Ju Wenjun (Chn) beat Olga Girya (Rus) 1-1, 1-1, 1.5-0.5; Pham Le Thao Nguyen (Vie) lost to Anna Muzychuk (Ukr) 0-2; Alexandra Kosteniuk (Rus) beat Pia Cramling (Swe) 1-1, 1-1, 2-0; Sopiko Guramishvili (Geo) lost to D Harika (Ind) 1-1, 1-1, 1.5-0.5; Nana Dzagnidze (Geo) beat Shen Yang (Chn) 1.5-0.5; Natalija Pogonina (Rus) lost to Ni Shiqun (Chn) 0.5-1.5; Antoaneta Stefanova (Bul) beat Nino Khurtsidze (Geo) 1.5-0.5; Tan Zhongyi (Chn) beat Padmini Rout (Ind) 1-1, 1-1, 1.5-0.5.