Hawley's Himalayan Database records 3,681 ascents of Cho Oyu of which 18 are unrecognised since 1960, despite the difficulty of finding Cho Oyu's technical summit, and that older expeditions considered the summit plateau as sufficient. Chamoux's 1990 Cho Oyu expedition comprise seven of these unrecognised ascents (including Alan Hinkes), while a German commercial trekking expedition, led by Günther Härter, who summited Cho Oyu just 19 days after Chamoux in 1990 (and also in very low visibility, as recorded by the Germans), comprise another six.