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Russian Valieva, who recorded a positive doping test in December, finishes fourth after falling on ice
15-year-old led by almost two points after free programme event on Tuesday
She had already won gold in team event before positive doping result became public
Britain's Natasha McKay failed to qualify for free skate
Image source, GettyGreat Britain's women will return to the Ice Cube tomorrow to take on Sweden for a place in the gold-mdeal match.
Great Britain's men are going to be taking the stage to take on the United States in their own semi-final at 12:05 GMT today.
Round-robin: South Korea 4-8 Sweden
Great Britain are into the last four! Eve Muirhead's team took a roundabout scenic route with four losses in the pool stage, but they are in the play-offs. The slate is clean and the medals are up for grabs...
Round-robin: South Korea 4-6 Sweden (after nine ends)
Sweden's final stone is a good un.
South Korea need something miraculous to snatch victory and shunt Great Britain out of the final four...
Image source, Getty ImagesRound-robin: South Korea 4-6 Sweden (after nine ends)
South Korea with it all to do. The 'Garlic Girls' have two stones to throw.
The first is a decent effort, but Sweden are still lying two.
One each to go.
Round-robin: South Korea 4-6 Sweden (after nine ends)
Thomas Duncan
BBC Scotland in Beijing
All you can here in the Ice Cube are the sounds of the Swedish and South Korean players debating their shot selection.
The tension.
Speed skating women's 1,500m
Image source, Getty ImagesA quick update before we get back to the tension of the curling...
GB's Ellia Smeding has posted her time in the speed skating 1,500m.
As ever in the long track speed skating, the fastest time wins - rather than the first-across-the-line races of the short track.
There are two skaters on the ice at one who start in their own lane.
With the skaters going in reverse order from their rankings, Smeding went in the second pairing.
She went around in one minute 17.17 seconds which currently has her fifth but is unlikely to threaten the top end of the standings.
Round-robin: South Korea 4-6 Sweden (after nine ends)
Sweden are well set in the early part of this final end with a good cordon of yellow stones in the circle.
South Korea have the hammer though so will slide the final stone.
If Sweden win, they will actually play Great Britain in the semi-finals.
#bbcolympics
Greenwood JBJ: Watching the curling is like watching the last day of the season hoping results go your way.
Mel Scriven: YES EVE MUIRHEAD!!! (And Anna Hasselborg!!!)
Neil Armstrøng: Jeez! This curling malarkey is intense. Come on Sweden!
Thomas Duncan
BBC Scotland in Beijing
Image source, GettyAs Great Britain took four to win the match, Sweden just edged into a 6-4 lead against South Korea with one end left.
Switzerland have beaten Japan.
So if the Swedes hold on, GB will go through on Draw Shot Challenge rankings ahead of Japan and Canada.
Round-robin: ROC 4-9 Great Britain
Image source, Getty ImagesEve Muirhead with another ripe peach!
A superb stone to clonk the Russian effort to the boards!
ROC concede as Britain take four points.
And all attention flips over to the one remaining match on the sheet...
Curling - ROC 4-5 Great Britain
Steve Cram
Curling commentator on BBC TV
Alina Kovaleva threads it through into the four-foot. She does lie shot now, but Eve Muirhead has a chance to remove that.
So much pressure on both skips.
Round-robin: ROC 4-5 Great Britain (after eight ends)
Superb from Alina Kovaleva!
The ROC skip replies with a sublime effort of her own!
ROC lie one with Eve Muirhead to slide for the final time...
Round-robin: ROC 4-5 Great Britain (after eight ends)
Superb from Eve Muirhead!
The GB skip breaks out into a huge grin as she slides a stone through a gap and shunts the red Russian stone out the house.
Britain are lying four! And ROC have only one stone left up their sleeve...
Speed skating women's 1,000m
Image source, Getty ImagesGreat Britain's Ellia Smeding returns to the ice from 08:30 in the long track 1,000m speed skating.
Smeding became Team GB's first female speed skater at the Olympics in 42 years earlier in the Games in the 1,500m.
She finished 27th in that one.
Her boyfriend Cornelius Kersten is also competing in Beijing. Together they own a coffee shop.
Women's curling - ROC 4-5 Great Britain (after eight ends)
Thomas Duncan
BBC Scotland in Beijing
Denmark have thrown in the towel, so Canada win 10-4.
GB need Switzerland to beat Japan, they're currently 8-4 up.
They also need Sweden to defeat South Korea, and they're 5-4 up.
Still time, but GB are heading through as things stand.
Image source, Getty ImagesCurling - ROC 4-5 Great Britain
Steve Cram
Curling commentator on BBC TV
That was a very good try, but Eve Muirhead caught her own yellow stone. It's a steal for ROC.
Round-robin: ROC 4-5 Great Britain (after eight ends)
Argh! An agony of inches and what-might-have-beens for Eve Muirhead.
Her stone buts up against the Russian stone, but cannot quite get it out of primary position.
Two ends to go...
Curling - ROC 3-5 Great Britain
Jackie Lockhart
Four-time Olympic curler on BBC TV
This isn't easy for Eve Muirhead to get to that red stone - there is a red guard and an even higher yellow guard.
Is there a hole there? I think it will ricochet off the two yellows.
Round-robin: ROC 3-5 Great Britain (after seven ends)
A superb final stone from the ROC skip. A red stone now lying bang over the bullseye.
Eve Muirhead has to try and evict it with her final effort...
Women's combined
Anna Thompson
BBC Sport in Beijing
Mikaela Shiffrin has recorded a third DNF - did not finish - at these Games, this time in the combined race which is a downhill and one run of a slalom.
She was in contention after the downhill but did not complete her slalom run.
Shiffrin is still at a loss to explain why she has struggled to finish in the technical events at the Yanqing National Alpine Centre.
"I didn't make it to the finish again and ... 60% of my DNF rate for my entire career has happened at this Olympic Games," she said.
"So it is just a little bit of a mind-boggling event I guess."