That wraps up our coverage of today's big game at the top of the Women's Super League.

Chelsea's win at Arsenal has handed the previously invincible Gunners a second defeat in three league games.

It has also opened the door for Manchester City to go top if they win at West Ham later on Sunday - you can keep track of all the WSL scores by clicking here.

And please stay tuned to the BBC Sport website and app for full reports and match reaction as the day goes on. Until next time, goodbye.

Image source, Rex Features

Remember, you can watch highlights from today's WSL games on the Women's Football Show, on BBC One at 23:35 GMT tonight.

Our very own Alex Scott has been at Meadow Park this afternoon, taking in the big game of the day.

Time for some brief reaction then on what has already been a huge day in the WSL...

There goes the whistle - Chelsea have hung on and thrown the WSL title race wide open.

It might have been a different matter if Arsenal had played the rest of the game the way they attacked the final 10 minutes.

But Erin Cuthbert's brace ensures Chelsea get a measure of revenge for October's 5-0 defeat, despite Vivianne Miedema's record-equalling 15th league goal of the season for Arsenal.

Arsenal go close again!

Kim Little threatens to race clear in the box but is denied by a vital last-ditch tackle from Magdalena Eriksson.

A crucial. crucial intervention that might just have secured the points for Chelsea.

Image source, Rex Features

Superb reactions from Chelsea keeper Hedvig Lindahl to keep the visitors ahead.

Vivianne Miedema surges past two Chelsea defenders into the area and stays on her feet despite appearing to be pulled back. But her near-post shot is superbly turned around the upright by Lindahl.

Chelsea hanging on. When they really shouldn't be.

With Arsenal committing players forward, Chelsea break through Fran Kirby but her shot is too close to Gunners keeper Pauline Peyraud-Magnin.

There will be a few minutes of stoppage time to come - and you fancy there's another goal in this.

A great chance for Arsenal!

A near-post free-kick reaches Miedema and, slightly unsighted, she does well to direct a header on goal from around eight yards but Chelsea keeper Hedvig Lindahl dives to her to keep it out.

That goal ended a proud Chelsea defensive record that has seen their back-line fail to be breached for an amazing three months - and the last team to score against them?

That's right: Arsenal.

The Gunners' Jordan Nobbs was the last player to score against the Blues, all the way back on 14 October, when Arsenal ran out impressive 5-0 winners.

That was one of nine goals England midfielder Nobbs netted in a scintillating start to the campaign - but, sadly, her season was prematurely ended, and her hopes of playing in this summer's World Cup cast into doubt, after suffering an anterior cruciate ligament injury in November.

That is Arsenal top scorer Vivianne Miedema's 15th league goal of the campaign - equalling the record season's tally set last year by Birmingham City's Ellen White.

The Netherlands striker has eight more games - plus the rest of this one - to surpass that mark. You suspect she will.

Chelsea's Sophie Ingle is booked for a tackle from behind on Katie McCabe.

Image source, Rex Features

Arsenal bring on Denmark winger Katrine Veje for defender Janni Arnth in a last throw of the dice from Gunners boss Joe Montemurro.

The hosts are enjoying a bit more possession in the final third and a goal would make the last 10 minutes interesting - but Chelsea are defending superbly.

"Champions of England" is the chant going around from the visiting contingent of supporters - and Chelsea are giving themselves a real chance of defending that title.

That eventuality seemed unlikely when they dropped several points at the start of the season with a string of draws and that 5-0 loss to Arsenal.

But six straight wins have propelled them right back into the mix - this would be the seventh and arguably the most important of the lot.

Amazingly, Arsenal - who average more than four goals a game in the WSL this season - have failed to register a single shot on target today with just 20 minutes of the game remaining.

They did just earn a corner - which Chelsea keeper Hedvig Lindahl did not exactly deal with convincingly - but the Blues were able to scramble it clear.

Cuthbert won't be taking home the matchball today though - she's been substituted, with Ali Riley coming on in her place. Fran Kirby also enters the fray in a double substitution from the visitors.

Image source, Rex Features

Arsenal manager Joe Montemurro must be gazing over enviously at the Chelsea bench.

The Blues have the luxury of calling on England hotshot Fran Kirby if they need to.

Injuries mean Arsenal's bench is short on attacking options, and their chief goal-getter Vivianne Miedema - the WSL's top scorer with 14 league goals this season, remember - has barely had a sniff.

Just for a moment, Chelsea think they have doubled their lead as Beth England nods home Karen Carney's floated cross.

But the assistant's flag is up for offside - and TV replays prove that is the correct decision.

Another let-off for Arsenal, though, who can count themselves fortunate to still be in this game.