Chen came out of retirement for a fourth time to represent her country at the Games and become the first woman to win two Olympic gold medals in weightlifting.
O laid down the marker as she completed a 131kg clean and jerk lift at the second attempt to set a new record, but Chen responded magnificently with a 132kg effort.
And the 29-year-old finished with a flourish, lifting a massive 138kg on her last attempt to send her crowd into raptures.
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