• French judge marked French duo higher than US pair

• Petition calling for probe approaches 15,000 signatures

• ISU says it has ‘full confidence’ in scoring system

The International Skating Union (ISU) has defended the integrity of Olympic ice dance judging after a single judge’s scoring gap became central to the outcome of the gold medal contest, insisting variations across panels are expected and that safeguards exist to prevent bias from determining results.

In a statement released on Friday, the governing body rejected suggestions that the judging system failed during the competition, in which France’s Laurence Fournier Beaudry and Guillaume Cizeron narrowly defeated Americans Madison Chock and Evan Bates in one of the closest and most disputed finishes of the Milano Cortina Games.

• Choi wins snowboard halfpipe title with third run

• American star takes silver behind strong first round

The snowfall coming down on Livigno Snow Park on Thursday night helped produce one of the bigger Olympic upsets in snowboard history, as Chloe Kim’s bid to become the first rider to win three consecutive Olympic halfpipe gold medals fell just short.

Kim finished with a best score of 88.00 from her opening run, settling for silver behind surprise winner Choi Gaon of South Korea, whose heroic third run after an early fall earned 90.25 and rewrote the Olympic record books. Japan’s Mitsuki Ono took bronze with 85.00.

Fournier Beaudry and Cizeron’s Olympic competition is set against backdrop of assault and abuse allegations involving their former partners

The American duo of Madison Chock and Evan Bates, the reigning three-time world champions contentiously missed out on Olympic ice dance gold on Wednesday despite a flawless skate. But the controversy surrounding the event is not merely a debate over artistic and technical merits.

Gold went by a narrow margin to the French duo of Laurence Fournier Beaudry and Guillaume Cizeron. It was a stunning achievement for a partnership that is less than a year old. But the union was forged after the fallout from sexual assault allegations levelled at Fournier Beaudry’s boyfriend and former ice dance partner, while Cizeron is the subject of allegations of abusive conduct from his erstwhile skating partner.