Her compatriot Park Sung-hyun, who shared the lead with Chun after Thursday’s play, was tied second with China’s Shanshan Feng.
Park lost ground by hitting three bogeys in a disappointing round of 68.
“There is no benefit for just long hitters,” said Shanshan.“The rough is really long."
World number one Lydia Ko of New Zealand returned a 68 but she was nine shots off the pace.
(Reporting by Julien Pretot)
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