In what was a thrilling climax to an exciting heptathlon competition Nafi Thiam started the 800 metres knowing that her person record time was 9.47 seconds slower that the British athlete Jessica Ennis-Hill.
Ennis-Hill took the lead with Nafi Thiam lagging at the start. However after one lap the Belgian was 3.20 seconds behind the Britton and Jessica Ennis-Hill looked a dead certainty.
Meanwhile, Nafi Thiam gave it her all in what appeared to be a damage limitation exercise.
The Belgian finished on 2 minutes 16.54 seconds, another personal record, but still 7.47 seconds behind Jessica Ennis-Hill.
This left her with a 35 point advantage and Olympic gold.
In what was a great personal performance by Nafi Thiam she amassed a total score pf 6,810 points, more than 300 points more than her previous personal record.
A surprising, but nevertheless well-earned gold for Belgium after an excellent performance over the two days from Nafi Thiam.
Nafi Thiam path to gold
100 m hurdles 13"56 1,041 points (12th)
High jump 1.98m 1,211 points (joint 1st)
Shot put 14.91m 855 points (1st)
200 m 25.10 878 points (23rd)
Long jump 6,58m 1.033 points (1st)
Jevelin 53,13m 921 points (3rd)
800 m 2'16"54 871 points (7th)
TOTAL 6,810 (1st)