Postpublished at 60 mins
Harlequins 19-18 Exeter
Twenty minutes to go and this is well set. Two teams that have come to play and put on quite a show for those watching on.
This could go either way.
FT: Harlequins 26-39 Exeter
Exeter go level on points with leaders Wasps
Chiefs' sixth bonus-point triumph in a row
Quins' play-off hopes suffer major blow
Nathan Middleton
Harlequins 19-18 Exeter
Twenty minutes to go and this is well set. Two teams that have come to play and put on quite a show for those watching on.
This could go either way.
Harlequins 19-18 Exeter
Many people are trying to impress this man.
Henry Slade has George Ford and probably Owen Farrell to get ahead to be England 10. And then maybe Danny Cipriani or Alex Lozowski.
He's been brilliant with ball in hand but just kicked his restart into touch and his kicking from hand has been wayward at times.
Harlequins 19-18 Exeter
Just another three points for Harlequins' efforts, but they have the lead again.
This looks set for a very, very tight finish.
Harlequins 16-18 Exeter
Just a sudden burst through the gear by Harlequins, they're really in full flow.
The offloading is sublime. Some hero tackling. I haven't enjoyed a game as much as this in yonks.
Harlequins 16-18 Exeter
Oh dear Michele Campagnaro.
After a mistake by Danny Care at the base of the ruck, the Exeter centre bursts down field and then all he has to do is draw the man and put Olly Woodburn in.
He makes a real mess of it and Harlequins then win a turnover.
Harlequins 16-18 Exeter
Jamie Roberts tackles a man without the ball and concedes the penalty.
Henry Slade's left boot, in front of England head coach Eddie Jones, is accurate and long as Exeter regain a slender lead.
Harlequins 16-15 Exeter
Their driving maul is usually a thing of beauty in terms of its precision and accuracy but on their second line-out, Jack Yeandle over cooks his throw and Quins clear.
Harlequins 16-15 Exeter
So, Exeter, what have you got in return?
After Charlie Matthews is pinged for offside, they kick to touch for a line-out 12 metres out.
Harlequins 16-15 Exeter
He might be 36 but Nick Evans shows he's still go some gas.
The Kiwi fly-half reads Olly Devoto's pass, intercepts and sprints in for 25 metres or so out and just, JUST, about gets there before the recovering tacklers come in.
He is unable to add a conversion to his score.
Harlequins 16-15 Exeter
Harlequins 11-15 Exeter
We're back underway under the floodlights of the Twickenham Stoop.
HT: Harlequins 11-15 Exeter
I know he isn't on the pitch tonight, but Thomas Waldrom shows how much Exeter focus their game around carrying the ball.
Winger Olly Woodburn in the top five in the English top flight too.
HT: Harlequins 11-15 Exeter
A reminder that this is one of six games across the weekend:
Saturday
Sunday
As with every single English top flight game, we'll have live text and radio coverage of each match.
HT: Harlequins 11-15 Exeter
Some good news for earlier today if you're of a Harlequins persuasion.
Versatile hooker, and flanker, Dave Ward has agreed a new contract at Quins - for more on the story click here.
#bbcrugby
So what did you make of that first 40 minutes at the Stoop?
Send us your thoughts using #bbcrugby.
Harlequins 8-15 Exeter
Rob Baxter's Exeter have not been beaten in the league since October 30 and you can see why.
They've given as good as they have got and been clinical with their two tries.
Harlequins have been so easy on the eye with ball in hand tonight and might be scratching their heads a bit why they're not ahead.
That was really enjoyable.
Harlequins 11-15 Exeter
Something for Harlequins to take in the break.
Dave Ewers cynically stops an attack for a pretty obvious penalty and Nick Evans does the honours.
Harlequins 8-15 Exeter
Nick Evans makes a superb touchfinder from a penalty to get Harlequins within five metres.
Line-out, and a chance to strike... but they over throw and Exeter have the ball again.
Harlequins 8-15 Exeter
Whoa this is some try.
James Short goes on a mazy run, gives it to Olly Woodburn who makes a superb one-handed offload to Michele Campanaro who is cutting back on the inside to step once and cross.
Henry Slade on target from the tee on the stroke of half-time.
Harlequins 8-13 Exeter