Short track speed skater Elise Christie suffered Winter Olympics heartache for the second time this week after the race referee ruled she had not finished her 1500 metres heat at the Iceberg Skating Palace.

The 23-year-old Scot put in a final burst which saw her edge Italy's Arianna Fontana in a photo-finish, but the referee spotted that she had skated centimetres inside the black finish line instead of over it and had therefore not registered a time.

Christie's result was flagged up as DNF (did not finish), adding to the anguish she suffered on Thursday when she was disqualified in the final of the 500m for crashing into Fontana.

And Christie, fighting back the tears, then revealed she had also been the victim of threatening messages on social media following her 500m disqualification.

"I have had a few people threatening me," she told the BBC. "It's been a tough few days."

Speaking about Saturday's DNF ruling, she added: "I'm gobsmacked. I'm finding it quite hard."

GB short track coach Nicky Gooch, explaining the DNF ruling, said: "The referee has said Elise didn't cross the line. She has crossed inside the finish line and he has ruled that that is off-track. Therefore he is saying she hasn't finished the race.

"She (has) done nothing wrong in the race, tried to make sure she was nowhere near Arianna and get her on the line, but the referee has called off-track.

"It's been called before but not something that normally happens. I was shocked. I looked at the video and you're talking centimetres."

There was more disappointment for Team GB in the next heat for 23-year-old Nottingham skater Charlotte Gilmartin, who finished fifth out of six.

Great Britain's women's curling team made it three round-robin wins in a row at the Sochi Winter Olympics with a 10-8 victory over South Korea.

Losing 2-0 after the first end in the morning session at the Ice Cube Curling Center, skip Eve Muirhead's side immediately bounced back with a three then stretched 5-2 ahead.

However, South Korea could not be shrugged off easily, stealing two points in the ninth to lead by one going into the final end.

Muirhead saved the day, though, with three shots on hammer to leave GB with four wins and two defeats ahead of their meeting with Switzerland on Saturday night.

Great Britain's men's curling team saw their victorious streak in the Sochi 2014 round-robin stage come to an end as they were beaten 7-5 by defending Olympic champions Canada.

The game was a cat-and-mouse affair in the first five ends, with David Murdoch's GB rink - who had won five of their six matches to date and their last four in a row - stealing a point in the third to go 2-1 up and then, after the Canadians had responded with three in the fourth, posting two in the fifth to level at 4-4.

Following a blanked sixth, Canada used the hammer to register one in the seventh, and the two teams then traded individual points before Brad Jacobs' men stole another in the 10th to secure the victory.

British alpine skier Chemmy Alcott was crushed after finishing 23rd in the ladies' super-g in what is almost certain to be her last event at a Winter Olympics.

The 31-year-old was looking to build on her respectable result in the downhill earlier this week, but although she managed to complete her run on Saturday, with several athletes crashing out at Rosa Khutor Alpine Center, she was left thoroughly unsatisfied.

A time of one minute 29.14 seconds saw her finish 3.62secs adrift of gold medallist Anna Fenninger.

"The other day I had tears of happiness and now I've got tears of frustration," said Alcott. "It's amazing how quickly your expectations run away with you."

Alcott took little consolation from competing in her fourth Winter Olympics, despite only returning to full-time training in December after breaking her leg for a second time in August.

"I'm not here just to finish, just to compete - even after what I've been through I still wanted to come here and race," she said.

Austria's Fenninger triumphed by over half a second in a time of 1min 25.52secs, with pre-event favourite and super combined gold medallist Maria Hoefl-Riesch having to settle for silver.

The German was 0.55secs adrift, while another Austrian Nicole Hosp earned bronze after finishing a further 0.11secs back.